You need a visa for Gabon if you have a Japanese passport

Travellers need a visa to visit Gabon for Business or Tourism. A Gabon eVisa is the fastest and easiest way of obtaining a visa for Gabon because travellers can submit their applications and supporting documents online. Once the application is approved, travellers receive their eVisa confirmation electronically. Some travellers may encounter technical difficulties with the Gabon eVisa portal. Travellers who encounter difficulties must obtain a Visitor visa from their nearest consulate or local visa center. A valid visa is required to board the flight. If the visa is expired or doesn’t match the traveller’s passport information, travellers will not be able to board their flight.