A reversing operation detecting device for a work vehicle, in which a forward and reverse travel operating lever is favorable in operability and which stably detects the reversing operation of the operating lever to be capable of issuing a vehicle reversing alarm. An equalization circuit and enable circuit are operable with the sense amplifier. The transmission format may be determined based on one or more of available transmit power, transmission time interval, a coding dimension used for multiplexing, and transmit power used per code. where Qu: used capacity; Qa: product capacity; and Qsf: residual capacity in final year; and Qsf=f1.