To provide a floor mat capable of cleaning easily and setting inexpensively by making a cover part a circular arc cross section and integrally molding a cover formed into an upward projected shape on the floor mat.

An operator seat and a pair of consoles are provided in a cab, and a floor mat 14 is laid on a floor plate 12. A pair of travelling operation levers 16 are erected frontward of the operator seat and arranged so as to be operated frontward and rearward as shown by arrows 17a, 17b. The floor mat 14 is made of a synthetic rubber, synthetic resin or the like, formed so as to cover substantially the whole face of the upper face of the floor plate 12, and a cover part 15 is integrally formed on a part in which the operation lever 16 is connected to a travelling operation valve 18. A cover part 15 is made a circular arc cross section 15b projected upward of a floor 9, a pair of slits 15a, 15b allowing the horizontal movement of the operation lever 16 are provided, and the thickness of the slit 15b is formed so as to be gradually thinned toward the projection edge. Thereby, cleaning of the floor 9 can be performed.