Abstract: The rear wall portion has a curved portion curved in an approximately arc shape in top plan view to serve as a right or left end thereof. An engine is provided on the upper frame at a position in front of the rear wall portion in such a manner that an interspace is formed between the engine and the curved portion. An exhaust aftertreatment device is provided in front of the rear wall portion while being superposed over the interspace. The exhaust aftertreatment device comprises a first treatment section and a second treatment section. The first treatment section and the second treatment section are supported over the upper frame in a posture where respective longitudinal directions of the first and second treatment sections are oriented parallel to each other in top plan view and along the curved portion in top plan view.

Abstract: Provided is an upper slewing body allowing elements to be compactly arranged while preventing required length of a hydraulic pipe from increase. The upper slewing body includes an upper frame, an engine, a hydraulic pump coupled thereto, a control valve forward of the engine and rearward of a slewing axis, and a rear tank between the engine and the control valve. The control valve is oblique to a frame lateral direction so as to locate a front end portion thereof forward of an inner end portion thereof. The rear tank has a rear opposition side surface opposed to a rear side surface of the control valve while being oblique to the rear side surface thereto.

Abstract: A cab includes a floor plate that constitutes a floor surface of the cab and a frame-shaped lower frame which extends along a peripheral edge of the floor plate and which is fixed onto the floor plate. A swivel joint is arranged below the floor plate such that a part of the swivel joint overlaps with a peripheral edge of the lower frame in plan view. A floor-side projecting portion that projects upward is provided on the peripheral edge of the floor plate and a floor-side housing portion that houses the swivel joint is provided below the floor-side projecting portion. A frame-side projecting portion that projects upward is provided on the lower frame, and a frame-side housing portion that houses the floor-side projecting portion is provided below the frame-side projecting portion.

Abstract: A cab includes a floor plate that constitutes a floor surface of the cab and a frame-shaped lower frame which extends along a peripheral edge of the floor plate and which is fixed onto the floor plate. A swivel joint is arranged below the floor plate such that a part of the swivel joint overlaps with a peripheral edge of the lower frame in plan view. A floor-side projecting portion that projects upward is provided on the peripheral edge of the floor plate and a floor-side housing portion that houses the swivel joint is provided below the floor-side projecting portion. A frame-side projecting portion that projects upward is provided on the lower frame, and a frame-side housing portion that houses the floor-side projecting portion is provided below the frame-side projecting portion.