Spindle device

A spindle device comprising:

• a shaft;
• a housing through which the shaft is inserted;
• a bearing configured to rotatably support the shaft with respect to the housing;
• a tubular member fixed to the housing and extending outward along an axial direction of the shaft from an end surface of the housing that is located on another end side of the shaft;
• a slider configured to slide inside a tube of the tubular member along the axial direction of the shaft;
• and
• a clamping unit configured to selectively perform clamping and unclamping on a tool inserted into a through hole penetrating the shaft along the axial direction of the shaft, in accordance with sliding of the slider,
• wherein the spindle device further comprises:
• a holding portion provided on the end surface of the housing outside an outer peripheral surface of the tubular member and extending along the axial direction of the shaft, the holding portion being configured to hold a line-shaped member passing through an inside of the housing;
• and
• a cutout portion formed in the outer peripheral surface by reducing a thickness of the outer peripheral surface of the tubular member in part, and
• wherein at least part of the holding portion is disposed inside a space formed by the cutout portion.