Documents required are as follow :
*** The letter must be in the company's letter head with company's seal and contain the applicant's name, purpose of visit to the Kingdom, date of entry, length of stay and type of visa required, and signed by the authorized person(s) whose name(s) listed in the company's registration issued by the Ministry of Commerce of Thailand.
*** In the absence of signature of authorized person(s) in the letter of invitation, a letter of power of attorney authorizing other person(s) to act on his/her behalf must be submitted upon visa application.
*** The letter must be in the company's letter head with company's seal and contain the applicant's name, purpose of visit to the Kingdom, date of entry, length of stay, type of visa required and signed by the authorized person.
*** In the absence of letter of recommendation from the current employer / company in Japan, an original guarantee letter must be presented together with a copy of guarantor's passport or driving license duly signed by the guarantor.
*** A guarantor must be twenty (20) years of age or older, legally residing in Japan, must be able to confirm aspects of applicant's personal attributes such as name, age, physical description and some personal information and must be available to be contacted by the Embassy.