Therm Soonklang, a resident of Moo 1 village in Tambon Mae Kong, was last seen when he went into the forest to collect edible plants.
Relatives told police that items found near the bones belonged to Therm.
The search operation – led by the 36th Ranger Taskforce, forestry officials and police, assisted by volunteers using sniffer dogs – found the human skull and bones at about 11am on Monday.