The Senate began to be implemented from the announcement date of revision on August 5, B.E. 2518(1974) and is the advisory body of the religious group to make its development and operation of the religious affairs smooth.

The Senate is appointed by the leader of the religious group as the elder Buddhist priests and nuns (僧尼) who became the directors of the Executive Office and members of the Order Assembly and were recommended by the Order Assembly among old Buddhist monks (老師) of Class 2 and above with moral influence and wisdom and knowledge.

The Senate responds to consultation of the leader of the religious group and the term in office is not separately decided. The Senator includes a chairman and he/she is elected from the members. The term in office of the chairman is 4 years.

For the chairman's roles, he/she represents the Senate, sets dates of holding the agendas, and has the right to convene the Senate. The chairman must convene the Senate when the leader of the religious group 2/3 of the registered members request. It can take counsel from the Senate in emergency or handling important religious affairs.