A portable device is applied to a vehicle having an automatic parking function of allowing the vehicle to run and park automatically in a predetermined position in a state where a user is out of the vehicle. The portable device includes a forward button member which is operated by the user when moving the vehicle forward, and a backward button member which is operated by the user when moving the vehicle backward. The portable device further includes a signal output unit having a function of outputting an automatic parking instruction signal for setting the vehicle in an automatic parking mode by touch-operating both the forward and backward button members. In this configuration, the forward button member has a forward arrow light emitting portion, and the backward button member has a backward arrow light emitting portion.