Tool holder

A tool holder including a shaft-shaped tool body having a leading end portion on which is disposed a detachable cutting insert having a face, a flank, and a cutting edge forming an intersection ridge between the face and the flank,

• wherein an insert mounting portion, which has a shape of a recess, is formed so as to be notched corresponding to a shape of the cutting insert;
• a coolant supply passage is formed in the tool body,
• a coolant ejection member is detachably provided at the leading end portion of the tool body,
• the coolant ejection member includes a tubular, portion, an ejection hole that communicates with the coolant supply passage through the inside of the tubular portion and opens toward the flank and the cutting edge, and an ejection portion that is provided with the ejection hole,
• the tubular portion extends within the coolant ejection member so as to be inclined toward the cutting edge, with the ejection hole approaching at least one of a leading end side or a lateral side of the tool body, which is connected to the coolant supply passage,
• and the ejection portion is disposed in a housing recess including a notched portion formed in a shape corresponding to the ejection portion, and the notched portion opens to a bottom wall of the insert mounting portion at the leading end portion of the tool body, and
• the tubular portion of the coolant ejection member is configured to move along a central axis of the tubular portion from the coolant supply passage toward the flank and the cutting edge, the upper surface of the ejection portion corning into contact with the bottom wall of the insert, in response to coolant supply pressure acting on the coolant ejection member.