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;
• and
• a sensor unit comprising:
• a unit base located from the lower surface to the second side surface, comprising a first recessed portion open toward the lower surface, and a second recessed portion open toward the second side surface, and having an L shape in a cross section orthogonal to a longitudinal direction of the holder;
• a first sensor located in the first recessed portion, in contact with the lower surface, and configured to detect a physical quantity of the holder;
• and
• a second sensor located in the second recessed portion, in contact with the second side surface, and configured to detect a physical quantity of the holder in a detection direction orthogonal to a detection direction of the first sensor.