A switch seat body structure includes a main body for assembling with a switch component. The main body is composed of a metal head section in the form of a thin sheet structure and a nonmetal belly section. The main body is defined with an axis. The metal head section has a first wall normal to or inclined from the axis and a second wall connected with the first wall and parallel to or inclined from the axis. The first and second walls together define a space. The nonmetal belly section fills the space to connect with entire sections of the first and second walls as an integrated body. The switch seat body assembling structure improves the problems that the processing and manufacturing processes are time-consuming and troublesome and the material cost is higher.