A work machine comprising: a multijoint type work implement; a plurality of hydraulic actuators (5,6,7) that drive the work implement; an operation device (45,46) that gives instructions on motions of the hydraulic actuators (5,6,7); a notification device that notifies an operator of operation support information; and a controller having a notification control section that exercises control as to whether to notify the operator of the operation support information in accordance with a distance between a predetermined target surface, out of a plurality of discretionally set target surfaces, and the work implement, wherein the work machine further comprises a current terrain profile acquisition device that acquires a position of a current terrain profile to be worked by the work implement, and the controller includes a target surface comparison section that compares the position of the current terrain profile with a position of the predetermined target surface to determine a vertical position relationship between the current terrain profile and the predetermined target surface, characterized in that the notification control section notifies the operator of the operation support information in accordance with a distance between a target surface closest to the work implement and the work implement in a case in which the target surface comparison section determines that the target surface closest to the work implement is located below the current terrain profile, the notification control section notifies the operator of the operation support information in accordance with a distance between a target surface adjoining the target surface closest to the work implement in a motion direction of the work implement and the work implement in a case in which the target surface comparison section determines that the target surface closest to the work implement is located above the current terrain profile and that the target surface adjoining the target surface closest to the work implement in the motion direction of the work implement is located below the current terrain profile, and the notification control section suspends notification of the operation support information in a case in which the target surface comparison section determines that the target surface closest to the work implement is located above the current terrain profile and that the target surface adjoining the target surface closest to the work implement in the motion direction of the work implement is located above the current terrain profile. a multijoint type work implement; a plurality of hydraulic actuators (5,6,7) that drive the work implement; an operation device (45,46) that gives instructions on motions of the hydraulic actuators (5,6,7); a notification device that notifies an operator of operation support information; and a controller having a notification control section that exercises control as to whether to notify the operator of the operation support information in accordance with a distance between a predetermined target surface, out of a plurality of discretionally set target surfaces, and the work implement, wherein the work machine further comprises a current terrain profile acquisition device that acquires a position of a current terrain profile to be worked by the work implement, and the controller includes a target surface comparison section that compares the position of the current terrain profile with a position of the predetermined target surface to determine a vertical position relationship between the current terrain profile and the predetermined target surface, characterized in that the notification control section notifies the operator of the operation support information in accordance with a distance between a target surface closest to the work implement and the work implement in a case in which the target surface comparison section determines that the target surface closest to the work implement is located below the current terrain profile, the notification control section notifies the operator of the operation support information in accordance with a distance between a target surface adjoining the target surface closest to the work implement in a motion direction of the work implement and the work implement in a case in which the target surface comparison section determines that the target surface closest to the work implement is located above the current terrain profile and that the target surface adjoining the target surface closest to the work implement in the motion direction of the work implement is located below the current terrain profile, and the notification control section suspends notification of the operation support information in a case in which the target surface comparison section determines that the target surface closest to the work implement is located above the current terrain profile and that the target surface adjoining the target surface closest to the work implement in the motion direction of the work implement is located above the current terrain profile.