A power transmission communication unit (1, 201, 301, 401) comprising: a first unit (10, 410) including a first power transmission coil capable of transmitting electric power in a contactless manner, a first signal transmission coil capable of transmitting a signal in a contactless manner, and a first case that is provided with the first power transmission coil and the first signal transmission coil; and a second unit (20, 220, 320, 420) including a second power transmission coil capable of transmitting electric power to and from the first power transmission coil in a contactless manner, a second signal transmission coil capable of transmitting a signal to and from the first signal transmission coil in a contactless manner, and a second case that is provided with the second power transmission coil and the second signal transmission coil and capable of being fitted to the first case, wherein the first unit (10, 410) and the second unit (20, 220, 320, 420) have a positional relation such that the first power transmission coil and the second power transmission coil face each other along a first coupling axis direction, and the first signal transmission coil and the second signal transmission coil face each other along a second coupling axis direction orthogonal to the first coupling axis direction, in a state in which the first case and the second case are fitted to each other, characterized in that the first case has a fitting concave portion that is formed into a cylindrical concave shape and that is configured to receive the second case, in the state in which the first case and the second case are fitted to each other, the first power transmission coil and the second power transmission coil face each other along the first coupling axis direction with a bottom portion of the fitting concave portion interposed therebetween, and in the state in which the first case and the second case are fitted to each other, the first signal transmission coil and the second signal transmission coil face each other along the second coupling axis direction with a side portion of the fitting concave portion interposed therebetween, and the first signal transmission coil and the second signal transmission coil are positioned so as to be wound along the side portion. a first unit (10, 410) including a first power transmission coil capable of transmitting electric power in a contactless manner, a first signal transmission coil capable of transmitting a signal in a contactless manner, and a first case that is provided with the first power transmission coil and the first signal transmission coil; and a second unit (20, 220, 320, 420) including a second power transmission coil capable of transmitting electric power to and from the first power transmission coil in a contactless manner, a second signal transmission coil capable of transmitting a signal to and from the first signal transmission coil in a contactless manner, and a second case that is provided with the second power transmission coil and the second signal transmission coil and capable of being fitted to the first case, wherein the first unit (10, 410) and the second unit (20, 220, 320, 420) have a positional relation such that the first power transmission coil and the second power transmission coil face each other along a first coupling axis direction, and the first signal transmission coil and the second signal transmission coil face each other along a second coupling axis direction orthogonal to the first coupling axis direction, in a state in which the first case and the second case are fitted to each other, characterized in that the first case has a fitting concave portion that is formed into a cylindrical concave shape and that is configured to receive the second case, in the state in which the first case and the second case are fitted to each other, the first power transmission coil and the second power transmission coil face each other along the first coupling axis direction with a bottom portion of the fitting concave portion interposed therebetween, and in the state in which the first case and the second case are fitted to each other, the first signal transmission coil and the second signal transmission coil face each other along the second coupling axis direction with a side portion of the fitting concave portion interposed therebetween, and the first signal transmission coil and the second signal transmission coil are positioned so as to be wound along the side portion.