A switch device structure provides an ensuring system to improve the shortcoming of the conventional switch device. The switch device structure includes a main body and an operation button assembled with the main body. The main body defines a chamber in which a base seat is assembled. An operation body and a wire connection module are disposed on the base seat. The base seat is formed with a cavity in which an elastic unit is mounted. The elastic unit includes a fixed section and a free section. In response to the move of the operation body and with the fixed section serving as a fulcrum, the free section of the elastic unit can push a second contact of the wire connection module into contact with a first contact to close the circuit or away from the first contact to open the circuit.