With tourism purpose, Japan citizens are allowed to enter into Vietnam in 15 days single entry without visa. If you are planning to stay longer 15 days in Vietnam, or enter multiple time, or visit for business purpose, you need to apply for Vietnam visa before entering.

Applying Visa at the Vietnamese embassy in Japan

Embassy of the Socialist Republic of Vietnam in Japan
Address: 151-0062 Tokyo, Shibuya-ku, Motoyoyogi-for 50-11
Phone: + 81-3-34663311 / 13
Fax: + 81-3-34667652 / 12
Email: vnembasy@blue.ocn.ne.jp
Website : https://vnembassy-tokyo.mofa.gov.vn/

Consulate General Of Vietnam In Osaka – Japan
4-2-15 Ichinocho Higashi, Sakai-ku, Sakai-shi, Osaka 590-0952, Japan
Main line: +81-72-221-6666​
Fax : ​+81-72-221-6667​
E-mail : tlsqvn.osaka@mofa.gov.vn
Website : http://vnconsulate-osaka.mofa.gov.vn/​

Consulate General of the Socialist Republic of Vietnam in Fukuoka – Japan
4F, Aqua Hakata, 5-3-8 Nakasu, Hakata-ku, Fukuoka-shi, Japan 810-0801
Direct line:(+81) 922637668; Fax: (02) 6286 4534
Email: tlsqvn-fukuoka@mofa.gov.vn
Website: https://vnconsulate-fukuoka.mofa.gov.vn/

You can go to the above locations to apply for Vietnam visa directly.
Documents required:

• Fill in the visa application form and supporting documents
• The original passport must be valid for at least 6 months
• Submit 2 passport-sized photos taken without glasses
• Do the payment directly at the embassy

Visa on arrival

In addition, you can also apply for Visa On Arrival – a type of online visa. You just need to access the website and fill in the online application by providing some necessary information about yourself and do the online payment. Then, you will receive the approval letter. With this letter, you can feel free to book the flight ticket whenever you want.
Visa On Arrival can be just entered into Vietnam through 6 fixed international airports as below:

• Noi Bai international airport in Ha Noi city
• Tan Son Nhat international airport in Ho Chi Minh city
• Da Nang international airport in Da Nang city
• Cat Bi international airport in Hai Phong city
• Cam Ranh international airport in Nha Trang city
• Phu Quoc international airport in Phu Quoc island

At the airport in Vietnam, you need to prepare:

• The completed visa stamp application form
• Your original passport
• Stamp fees (USD)

You go to the Visa On Arrival counter and submit these documents and do the stamp fee. Then waiting for your turn to get the passport back and the visa stamp. With this visa stamp, you can enter into Vietnam from this time.

Visa on arrival fees for Japan citizens:

Depending on your purpose of visit, time of stay and number of entry, the price will be different. Please see the price list here.