PROBLEM TO BE SOLVED: To enable individual exchange of a plurality of pressure sensitive sensors in a shoe insole pressure sensor capable of employing a load detector which detects pressure applied on the foot of a user of a power assist suit, and the completion by only calibration of the exchanged pressure sensitive sensor.SOLUTION: A shoe insole pressure sensor 100 is provided with a flexible printed board 10 having a conductor electrically connected to pressure sensitive sensors 1a-1g mounted in respective mount parts. Outputs from the pressure sensitive sensors 1a-1g are taken out via the flexible printed board 10. On the basis of the outputs from the pressure sensitive sensors, the activation of an actuator generating assist force for a user is controlled.