WORK MACHINE

To provide a work machine in which an assembly work of a work device is simplified.SOLUTION: A work machine comprises: a front work device composed of a common boom whose base end is rotatably attached to a vehicle body and whose tip is an attaching portion (11c) and an extension boom having an attached portion (11d) detachably fixed to the attaching portion (11c) of the common boom; and a controller for displaying a guide line (51) which guides an operator to an insertion of a protrusion (31) of the attached portion (11d) of the extension boom between a pair of attaching bosses (21a, 21b) of the attaching portion (11c) of the common boom so as to be overlapped with an image of a camera (28) on a display (9).SELECTED DRAWING: Figure 8 【課題】作業装置の組立作業を簡素化した作業機械を提供する。【解決手段】作業機械は、基端が車体に回動可能に取付けられて、先端が取付部（１１ｃ）となった共通ブームと、共通ブームの取付部（１１ｃ）に対して着脱可能に固定される被取付部（１１ｄ）を有する継ぎブームとで構成されたフロント作業機と、共通ブームの取付部（１１ｃ）の一対の取付ボス（２１ａ，２１ｂ）の間への継ぎブームの被取付部（１１ｄ）の突出部（３１）の挿入をオペレータにガイドするガイド線（５１）をカメラ（２８）の映像に重ねて、ディスプレイ（９）に表示させるコントローラとを備える。【選択図】図８