Helical spring, torque generating device, movement for timepiece, and timepiece

The present invention provides a helical spring capable of suppressing self-contact or contact with surrounding members and generating a desired torque, a torque generating device, a movement for a timepiece, and a timepiece. A constant-force spring (100) is a spiral spring for a timepiece, which is wound around a first rotational axis (O1) to generate torque, and is equipped with an outer end (101) attached to a carrier and an inner end (102) attached to a constant-force lower-stage cylinder. The outer end (101) is attached to the carrier, the inner end (102) is attached to the constant-forcelower-stage cylinder, and in a state before winding in which no torque is generated, the distance between adjacent springs in a radial direction orthogonal to the first rotation axis (O1) varies depending on the position in the circumferential direction around the first rotation axis (O1). 本发明提供能够抑制自我接触或对周围的部件的接触并产生期望的转矩的螺旋形弹簧、转矩产生装置、用于钟表的机芯以及钟表。恒力弹簧(100)是围绕第一旋转轴线(O1)卷紧而产生转矩的用于钟表的螺旋形弹簧，配备有安装于承载件的外端部(101)和安装于恒力下级筒的内端部(102