An interior trim member of a work vehicle, wherein recessed parts (104, 105) to which an interfering body (110) present at an installation part is fitted are formed in the interference area of at least one end edge part of the interior trim member (100) with the interfering body. A cushion body (25) formed of an elastically deformable material is disposed at and around the recessed parts (104, 105), and a structural member (21) formed of a lightweight material harder than the cushion body (25) is disposed in the other area of the interior trim member (100) than the area where the cushion body (25) is disposed. A skin material (10), the structural member (21), and the cushion body (25) are formed integrally with each other by molding. Even when a column interfering with the interior trim member during the installation and removal is present at the operator's seats of various types of work vehicles, a rigid interior trim member installed in the operator's seats can be easily detached from and attached to an installation portion and the re-installation of ducts for air conditioner can be eliminated.