Rotation operation device

A rotation operation device comprising:

• a rotation shaft including a first end portion and a second end portion spaced apart from each other in an axial direction of the rotation shaft;
• a knob having conductivity, the knob being provided at the first end portion of the rotation shaft and being configured to rotate the rotation shaft;
• a touch sensor configured to detect a contact with the knob;
• and
• an elastic body having conductivity, the elastic body including a first end connected to the knob and a second end connected to the touch sensor,
• wherein the knob includes a surface facing in the axial direction of the rotation shaft towards the second end portion of the rotation shaft, the surface of the knob includes a recess portion recessed in the axial direction, and the first end of the elastic body is disposed in the recess portion, and
• wherein the knob includes:
• a knob main body having conductivity, the knob main body including the recess portion and being attached to the first end portion of the rotation shaft;
• and
• a plate member having conductivity, the plate member being fixed to the knob main body at a bottom surface of the recess portion.