A mechanism for attaching and detaching a tripod seat, comprising: a first tripod seat unit; and a second tripod seat unit to which the first tripod seta unit is detachably attached, wherein: one of the first tripod seat unit and the second tripod seat unit has a first fixing member and a second fixing member formed to be screwed together; the other of the first tripod seat unit and the second tripod seat unit has an attachment part brought to be in pressure contact with the second fixing member by screwing the first fixing member to the second fixing member; and by bringing the attachment part to be in pressure contact with the second fixing member, the first tripod seat unit is fixed to the second tripod seat unit.