A machining apparatus capable of performing chamfering with high precision is provided. A machining unit 13 is provided at a distal end portion 12a of an arm 12 of an articulated robot 11, and the machining unit 13 includes a profiling roller 57, which serves as a roller that abuts against a part to be profiled Wd of a workpiece W, and a rotatable tool 41 having an axis line 41a having a distance between the rotatable tool 41 and the profiling roller 57 in conformity with a width of the workpiece W (width of a band-like portion Wc) and extending in parallel with an axis line 57a corresponding to a support axis of the profiling roller 57, and the rotatable tool 41 includes cutting blades 41b or blade portions 73 and 73 as chamfering blades.