PURPOSE: To provide a journal pin which does not become loose even if it is hit by a punch or the like and is preventive of being pulled out from a journalled body.

CONSTITUTION: A journal pin for journalling a pair of journalled bodies, which has a male screw 12 on one end of its cylindrical shaft part 11 and, on the other end, a collar 13 which diameter is larger than the shaft part 11 and engages with one of the journalled body, is composed of a screw part 1, which has a tightening part such as a tightening pin 14 on the end opposite to the shaft part 11 of the collar 13, and a circular section nut part 2, which has a female screw 21 into which the male screw 12 is screwed, a locking part such as grooves 22 formed on one end, a diameter larger than that of the shaft part 11, and which engages with the other journalled body.