A Thai official caught on camera drunkenly stealing paintings from a Japanese hotel said on Tuesday he will resign.

News of the incident first emerged last week when Japanese media reported that the official had been arrested trying to steal three paintings from a hotel in Kyoto.

Hotel staff noticed the paintings - worth around $125 - were missing, checked the building's CCTV and swiftly identified the culprit, Suphat Saguandeekul, a 60-year-old official with Thailand's Commerce Ministry.

Suphat - who is deputy director of the Department of Intellectual Property, tasked with trying to roll back Thailand's reputation as a counterfeit hub - was promptly arrested and charged with theft.

"After I finished my mission in Japan I met with some university friends. We were drunk and I unconsciously and unintentionally committed an inappropriate act," Suphat said in his resignation letter on Tuesday.

Suphat, who had extended his stay in Japan after a government trip to Osaka, added he was "profoundly sorry" in the letter sent to media.

In the wake of his arrest last week, Thai diplomats scrambled to secure Suphat's release, which they did after he admitted his guilt and paid the hotel compensation.

On his return home the Commerce Ministry initially announced he would be "transferred" to a new role pending an investigation.

That decision sparked public anger and much online mirth in a country where government officials are rarely sacked for wrongdoing and instead quietly moved to different posts.