Mechanical pencil unit, retractable writing instrument, and method of manufacturing mechanical pencil unit

摘要

PROBLEM TO BE SOLVED: To easily mount a core breaker on the front end side in a holding cylinder. A mechanical pencil unit is provided with a lead core feeding mechanism M1 configured to feed a lead core x through a core breaker 30 and a holding cylinder 10 having the lead core feeding mechanism M1 therein, and holding The cylinder 10 includes a first cylinder portion 11 and a second cylinder portion 12 that is connected to the rear side of the first cylinder portion 11 and that projects the core breaker 30 through the front end opening and projects forward. The core breaker 30 is integrally provided, and is formed so that it can be inserted into the front end opening of the second tubular portion 12 from the front side thereof. [Selection diagram]