Support structure for load measurement sensor

Provided is a support structure for a load measurement sensor having sufficient durability without adding a large load to a portion transmitting a load to the load measurement sensor. In a support structure for a load measurement sensor (30) which supports the load measurement sensor (30), including a sensor body (32) detecting a load generated from a seat Z having a seat frame (1) and an extension shaft portion (31) extending from the sensor body (32), to attachment brackets (15 and 16) in a state where the extension shaft portion (31) follows the horizontal direction, the support structure includes a load input portion (42) which comes into contact with the sensor body (32) and inputs a load to the sensor body (32), the sensor body (32) includes a load receiving surface (37a) which comes into contact with the load input portion (42) and receives the load, and the load input portion (42) is formed so as to be movable in the axial direction of the extension shaft portion (31) with respect to the load receiving surface (37a).