Holder, cutting tool, and method for manufacturing machined product

A holder, having a bar shape extending from a first end to a second end along a central axis and the holder comprising:

• a first end surface located on the first end;
• a first lateral surface extending from the first end surface toward the second end;
• a pocket which opens into the first end surface and the first lateral surface and which permits attachment of a cutting insert;
• a main coolant hole extending from a side of the first end toward a side of the second end;
• a first sub coolant hole connected to the main coolant hole;
• and
• a second sub coolant hole which is located closer to the second end than the first sub coolant hole, the second sub coolant hole connected to the main coolant hole to which the first sub coolant hole is connected, wherein
• the first sub coolant hole comprises a first opening that opens into the first lateral surface,
• the second sub coolant hole comprises a second opening that opens into the first lateral surface,
• a width of the first opening in a direction along the central axis is smaller than a width of the second opening in the direction along the central axis, and
• the width of the second opening in the direction along the central axis is larger than an interval between the first opening and the second opening.