Torque measuring device

A torque measurement device is provided with: a cylindrical coil unit (4) having a detection coil for changing a voltage in accordance with a change in the magnetic permeability of a magnetostrictive effect section of a rotating shaft; a cylindrical back yoke (5) disposed coaxially around the coil unit (4); a holder (6) that holds the coil unit (4) and the back yoke (5); and a circuit (7) that generates an output voltage corresponding to the voltage of the detection coil, and a radial gap (C) is provided between the outer peripheral surface of the coil unit (4) and the inner peripheral surface of the back yoke (5). The change range of the gap (C) accompanying the temperature change during use is limited to a range in which the change of the output voltage is linear with respect to the change of the gap (C). 转矩测量装置具备：圆筒状的线圈单元(4)，其具有与旋转轴的磁致伸缩效应部的导磁率的变化对应地使电压变化的检测线圈；圆筒状的背轭(5)，其同轴地配置在该线圈单元(4)的周围；保持架(6)，其保持线圈单元(4)以及背轭(5)；以及电路(7)，其产生与上述检测线圈的电压相应的输出电压，在线圈单元(4)的外周面与背轭(5)的内周面之间设置有径向的间隙(C)，伴随着使用时的温度变化的间隙(C)的变化范围被限制在上述输