PROBLEM TO BE SOLVED: To provide a door device capable of reducing the number of parts and facilitating the formation of layout of parts by integrating intertruss bracing parts for suppressing vibration of a door panel with a latch device. SOLUTION: In this door device, a latch mechanism part 43 is provided on a door panel of a side door of a hydraulic shovel, and a striker 44 is provided in a frame on a machine body side. The striker 44 is constituted by forming a plurality of intertruss bracing slope parts 46 by swelling into a V-shape on a latch mechanism part 43 side for a pair of upper and lower mounting base parts 45 and protruding a hook fitting 48 from a tip plane part 47 between these intertruss bracing slope parts 46. The latch mechanism part 43 is formed by cutting a latch groove part 55 in which the hook fitting 48 of the striker 44 is fitted into a U-shape in body plates 52a, 52b in a mechanism body part 52, and upper and lower intertruss bracing regulation parts 56 are integrally formed into a V-shape on an opening side of the latch groove part 55. COPYRIGHT: (C)2009,JPO&INPIT