Cutting tool, and method for manufacturing machined product

A cutting tool comprising:

• a holder having a rod shape extending from a front end toward a rear end and comprising:
• a front end surface located on a side of the front end;
• an upper surface extending from the front end surface toward the rear end;
• a lower surface located on an opposite side to the upper surface;
• a first side surface located between the upper surface and the lower surface and extending from the front end surface toward the rear end;
• a second side surface located on an opposite side to the first side surface;
• and
• a pocket open to the front end surface, the upper surface, and the first side surface;
• a cutting insert located in the pocket and comprising a cutting edge;
• a sensor located on an outer surface of the holder on a side of the front end and configured to detect a physical quantity of the holder;
• and
• a wiring member electrically connected to the sensor and extending from a side of the sensor toward the rear end, wherein
• the holder further comprises a groove open to both the lower surface and the second side surface and extending from the side of the front end toward the rear end, and
• the wiring member is located in the groove.