An occupant restraint device controller, including an electronic circuit substrate incorporating therein a control circuit that determines whether or not a vehicle has collided based on a detection output of a sensor detecting acceleration/deceleration of the vehicle and outputs a control signal for activating an occupant restraint tool. The electronic circuit substrate is accommodated inside a resin case provided with a structure for leading out a ground electrode from the inside to the outside of the resin case. The structure for leading out a ground electrode is configured such that a fixing leg, for fixing the electronic circuit substrate, is provided inside the case. This fixing leg is connected to a mounting portion, to be mounted to the vehicle, via a ground lead-out member that includes a first spring structure held between the fixing leg and the electronic circuit substrate, a ground terminal held between the case and part of the vehicle, and a second spring structure connecting the first spring structure to the ground terminal.As a result, grounding and sensor performance similar to that of conventional counterparts is achieved while a resin case is employed.