PURPOSE: To make mounting and dismounting of front attachment including hydraulic crusher or the like to and from a shovel machine easy, and to ensure interchangeability among front attachments in various sizes that are slightly different in such dimensions as distance between connecting holes and diameter of the connecting holes.

CONSTITUTION: A front attachment-mounting connection 1 composed of an upper bracket 8 that can be connected with pins to a shovel machine and a holding device equipped with fixed hooks 10 and movable hooks 11 that are placed facing each other for holding upper brackets of one of various types of front attachments is interposed between the shovel machine and one of the various types of the front attachments. The distance between the fixed hooks 10 and the movable hooks 11 can be adjusted in expansion or contraction by moving the movable hooks 11 horizontally by operation of a feed screw rod 14, and the connection 1 can be held with hooked parts 10a and 11a pressed against the two upper brackets.