Japan MLIT Drone Regulations Overview

Pilots arriving in Japan from abroad often carry one assumption that gets them in trouble fast: that 250 grams is the line for whether a drone needs to be registered. Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT) set its threshold well below that. Registration is also only one of three separate systems (registration, a risk-based flight category, and location-specific approval) that a flight can trigger independently of each other. Here is how they fit together.

Japan's threshold is 100 grams, not 250

Under Japan's Civil Aeronautics Act, drones and model aircraft weighing 100 g or more that fly outdoors must be registered. Registration runs through DIPS (the Drone/UAS Information Platform System, now DIPS 2.0). According to MLIT's registration portal, an unregistered aircraft cannot be flown, and violations of the Civil Aeronautics Act can lead to penalties; check the portal for the current terms. The registration is valid for three years and can be renewed through DIPS 2.0. The registration number must be displayed on the aircraft.

The trap is specific: a "toy-class" drone that weighs under 250 g and triggers no paperwork in some other countries can still clear Japan's 100 g bar with room to spare. Pilots who compare a spec sheet only with the threshold they know from other rulebooks end up flying unregistered without realizing it. Registered aircraft must also be equipped with Remote ID, which broadcasts identification data by radio without personal information. MLIT names narrow exceptions: aircraft registered during the advance registration period (20 December 2021 to 19 June 2022), until their next renewal; flights in a secured and marked area with assistants; and tethered flights.

Three risk categories decide whether you need permission

MLIT sorts flights into three categories by risk rather than treating every flight the same way. Category I covers flights that are not "specified flights"; under the Civil Aeronautics Act these need neither permission nor approval. Category II covers specified flights where the area beneath the flight path is secured by access control (keeping out everyone except the pilot and helpers), so no third parties are overflown. Category III covers specified flights without access control, where third parties are overflown. This includes "Level 4" flights, meaning beyond visual line of sight over populated areas without observers.

Which permission you need depends on the category. In Category II, permission is always required for flights near airports, above 150 m, over event venues, carrying dangerous goods, dropping objects, or with aircraft of 25 kg or more. For the other Category II cases (for example over a DID, at night, beyond visual line of sight, or within 30 m of people or property, with aircraft under 25 kg), individual approval can be waived if the pilot holds a pilot certificate, the aircraft is certified, access control is in place and a flight manual exists; otherwise individual approval is needed. Category III always requires permission. In practice, a hobby drone flown over an empty rice field far from any town needs no MLIT paperwork, while the same drone launched from a city park can require Category II permission, even though the park looks just as quiet as the field.

DID follows population density, not what the place looks like

That city-park example matters because a Densely Inhabited District (DID) is a statistical boundary drawn from the national census, not a judgment about how many people happen to be standing nearby. According to Japan's Statistics Bureau, DIDs covered about 3.5% of the country's land area in the 2020 census, yet around 70% of the population lived in them. That is why the convenient flying spots near residential areas often fall inside a DID. The mistake is predictable: a pilot flies at 6am in a nearly empty park, concludes from the emptiness that no restriction applies, and never checks the DID map. In fact the density of the surrounding area triggers the permission requirement, regardless of who is there right now. DID areas are shown on the airspace map of the Geospatial Information Authority of Japan (GSI), which MLIT links to.

A pilot certificate is mandatory for only some flights

Japan's pilot certificate for unmanned aircraft comes in two classes (1st class and 2nd class) and is issued for three years. MLIT stresses that a certificate is needed only for flights under certain conditions (airspace and type of flight); it is not required simply to fly a drone. Even when a flight needs permission, a certificate is therefore not always required. In Category II you can apply for individual approval, or, in the cases described above, the approval can be waived if a pilot certificate, an aircraft certification, access control and a flight manual are all in place. A certificate is mandatory for Category III, flying without access control over third parties. There you need a 1st class certificate holder flying a certified 1st class aircraft, plus a risk-based flight manual and permission. This has two practical consequences: some pilots invest in a certificate even though a Category II application would have been enough for a routine flight over a DID. Others assume that a simple DIPS registration also covers a Category III operation and find out otherwise when the application is rejected.

Other rules that apply no matter what

A separate law protecting important facilities can prohibit flights nearby, regardless of registration and flight category. According to Japan's National Police Agency, it covers, among others, the Diet, the Prime Minister's official residence, the Imperial Palace, embassies, defense facilities, airports and nuclear facilities. Prohibitions apply above the facility itself (the red zone) and within a radius of about 1,000 m (the yellow zone), and violations can bring fines of up to 500,000 yen or imprisonment. So this is not something that registration or a Category I flight frees you from.

The Civil Aeronautics Act also sets baseline rules for every flight. According to MLIT's basic rules, these include: no flying under the influence of alcohol; checking the weather, the condition of the aircraft and the battery charge before flight; flying only between sunrise and sunset; keeping the aircraft within sight; keeping at least 30 m from people and from their buildings, vehicles and other property; not flying over crowds such as festivals or events; not dropping anything; and not carrying dangerous items such as explosives. Flights at 150 m or more above the ground require safety measures and permission. Deviating from these rules is possible only with safety measures and permission.

Common mistakes worth avoiding

Assuming the 250 g threshold from other countries also applies in Japan, and skipping DIPS registration for a drone that exceeds Japan's 100 g line.
Judging DID status by how quiet a spot looks rather than checking the DID boundary for the site.
Believing that MLIT permission always requires a pilot certificate, or the reverse, that a certificate replaces permission for every flight.
Overlooking the separate important-facilities prohibition, which can apply even to a registered, properly permitted aircraft.

Practical checklist

Weigh your drone with the battery installed and register it through DIPS if it weighs 100 g or more.
Check whether your planned site lies inside a DID before assuming no permission is needed.
Work out which of the three flight categories your plan falls into, and apply for Category II or III permission if needed.
Check whether a pilot certificate applies to your specific flight rather than assuming it is always, or never, required.
Verify current requirements and obtain final permission through the official DIPS portal. This guide is for information only, does not replace a flight approval and is not legal advice. You can find an overview of the legal situation in Japan on our page on drone regulations in Japan, and the FlyDroneMap dashboard shows current weather data for flight planning.