To largely secure the cooling wind sucking area of a cooling wind sucking port while considering design of a front grille by opening the underside of hollow frame bodies horizontally arranged in plural stages in a cooling wind sucking part of the front grille.

A hood 6 is arranged in a front part of this machine for suspending front wheels 1 and rear wheels 2 in front and in rear, and a front grille 7 is arranged in front of this hood 6. A cooling wind sucking port 16 for sucking a cooling wind of an engine 5 inside the front grille 7 and the hood 6 is opened, for example, in a front face and both side faces of the front grille 7, and frame bodies 17 are horizontally arranged in plural stages in this cooling wind sucking port 6. A mesh-like filter 18 composed of punching metal is arranged inside the frame bodies 17 in the cooling wind sucking port 16 to prevent dust and dirt from outside from entering the inside of the hood 6.