To provide a uniform working quality by facilitating the working and enhancing the workability when a skirt part is formed at the longitudinal one end of an accessory for a metal external wall.

This working tool for an accessory is provided with: a first gripping part 2; and a second gripping part 3 which have chevron-shaped outlines. The first gripping part and the second gripping part have generally L-shapes in cross section which can be combined with each other. An outer edge 7 projects from one of the gripping parts at the top part 4, and an inner edge 8 is recessed in the other. The first gripping part and the second gripping part are connected to each other through an elastic member 12. The accessory is inserted and removed between the first gripping part and the second gripping part. The working tool 1 for an accessory cuts and bends a part of the longitudinal one end of the accessory at the corner part.

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