A noncontacting short-range communication device for a slide door for excellently performing bidirectional data communication by electromagnetic induction coupling between the side of a vehicle body and the side of the slide door is provided. Data are transmitted and received between the first communication unit 31 connected to the first antenna member 17 and the second communication unit 41 connected to the second antenna member 18 by the electromagnetic induction coupling of the first and second antenna members 17, 18. Each of the first and second communication units 31, 41 includes a microcomputer 34, 44 and a data communication circuit 33, 43 for performing semi-duplex bidirectional communication. Each of the data communication circuit 33, 43 includes: a transmitting section 33A, 43A, to which a clock pulse of the microcomputer 34, 44 is supplied, for transmitting a modulated wave obtained by on-off modulating the clock pulse as a base signal with the data having a serial communication form through the antenna member 17, 18; and a receiving section 33B, 43B for receiving and demodulating the modulated wave so as to gain the data.