To constitute a collision detection sensor having less components.

The collision detection sensor 10 comprises an acceleration sensor 11 where an acceleration detection element and an electronic circuit for outputting an electric signal according to acceleration by functioning the acceleration detection element are packaged, a pair of connectors 12, 12 having a section 12a that has the function of the wiring of a circuit board for packaging the acceleration sensor 11 and packaging patterns, a housing 13 for accommodating the acceleration sensor 11 and each connector terminal 12, and an externally mounted electronic component 14 such as a capacitor.