Chuck device

A chuck device in which a rotary sleeve provided to a main body is rotated, and the rotation of an annular rotary body which rotates together with the rotary sleeve is configured to cause jaws screwed together with the rotary body to expand, contract, advance, and retreat, and a tool to be gripped by the jaws;

• said chuck device comprising:
• an annular retaining engaging body configured to engage with said rotary body or said main body and prevent said rotary sleeve from coming out of the rotary body or the main body;
• and a rotation transmission part configured to directly or indirectly transmit the rotation of said rotary sleeve to said rotary body provided to the retaining engaging body, wherein the retaining engaging body is provided so as to be fixed to a proximal end side of said rotary sleeve, the rotation of said rotary sleeve is configured to be transmitted to said rotary body via said retaining engaging body, and the rotary body rotates together with said rotary sleeve, and said retaining engaging body is provided with a plate-shaped co-rotation fitting part as said rotation transmission part configured to fit with a recessed part or projected part provided to said rotary body, the co-rotation fitting part comprising a side extending substantially parallel to a rotational axis of the rotary sleeve configured to abut a sidewall of the recessed part or projected part provided to said rotary body, wherein the retaining engaging body further comprises protruding parts connected to said retaining engaging body separately from said co-rotation fitting part and configured to abut the rotary body or the main body, the protruding parts extending in a direction intersecting with the rotational axis of said rotary sleeve.