PROBLEM TO BE SOLVED: To provide a multi-core writing tool capable of automating an assembly work. A multi-core writing instrument of the present invention includes a barrel provided with an opening that opens rearward, a plurality of cursives that are interchangeably housed in the barrel, and a crown that closes the opening. , Is equipped. A plurality of front window holes extending in the front-rear direction to reach the opening are radially distributed and penetrated in the side wall of the barrel, and the side wall of the crown is provided so as to correspond to the front window hole. A plurality of rear window holes extending in the anteroposterior direction and reaching the anterior end of the crown are radially distributed and penetrated. When the operating unit of each operating body projects radially outward from at least one of the corresponding front window hole and rear window hole, and an operating unit is slid forward on the barrel or the crown. A locking portion capable of locking a part of the operating body corresponding to the operating portion is provided. The barrel and the crown can be engaged with each other by sliding in the front-rear direction. [Selection diagram] FIG. 14
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