A target object detection device is provided. A movable contact holder holds a movable contact, faces an inner side face of the control knob, and is supported on the switch base via a second pivotal shaft. A plurality of distribution assemblies are operationally coupled to the fluid control assembly whereby the distribution assemblies are in fluid communication with the fluid control assembly. Feed from an internal hopper flows downward in the discharge pipe in a predetermined amount prior to being discharged by the blast of air.