To provide a reach forklift truck capable of simplifying a rattling prevention structure at an outrigger part and particularly easily performing mounting work thereof.

A rattling prevention device 19 for preventing rattling of a moving body 12 moved in a guide groove 3S of the outrigger part 3 of the reach forklift truck is constituted by: a mounting body 21 comprising a vertical fixed part 22 fixed to a mast support member 17, i.e., a side surface part of the moving body and a horizontal mounting part 23 provided on a lower part of the vertical fixed part; a horizontal guide roller 25 provided on the horizontal mounting part of the mounting body rotatably around a vertical axis and capable of contacting an end edge part of a lower flange part 3b of the moving body for forming the guide groove; and a slide-contact member 26 provided at a guide groove side on the horizontal mounting part and capable of slide-contacting an upper surface of a lower part of the guide groove of the moving body.