To provide a sensor device achieving bulk production by electric welding between a terminal of a detecting element and a round bar-like terminal even if the latter is used to enhance waterproof.

The sensor device is characterized by including a case 21, a detecting element 22 contained in the case 21, an elastic body 24 pressed in to fit into the case 21, and a round bar-like terminal 23 connected with the terminal 22a of detecting element 22 electrically at an edge and pressed to penetrate through the elastic body 24, in which one edge of the round bar-like terminal 23 has a flat section 23a so as to connect the terminal 22a of detecting element 22 with the flat section 23a.