You may need a visa for Laos if you have a Japanese passport
Visa options for Laos
Electronic visitor visa is required for trips longer than 15 days
Travelers need a visa to visit Laos for Business or Tourism for more than 15 days. Travelers do not need a visa if staying for 15 days or less. A Laos eVisa is the fastest and easiest way of obtaining a visa for Laos because travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically.