A tape feeder configured to be attached to and detached from a feeder setting section of a component mounter, the tape feeder comprising: a feeder main body; a reel holder configured to load a tape reel around which a component supply tape is wound; a reel displacement mechanism (41, 42) for holding the reel holder in such a manner as to be displaced in a width direction thereof relative to the feeder main body; a holder cover (14, 37) of sheet metal which is attached to at least a part of a side surface of the reel holder; and guide sections (53, 54) provided at both end portions of the reel holder in attaching and detaching directions to guide the tape feeder when the tape feeder is attached to or detached from the feeder setting section in such manner that end edges in the attaching and detaching directions of the holder cover (14, 37) of the tape feeder are not caught by an adjacent tape feeder, wherein respective portions of the guide sections (53, 54) that project in the attaching and detaching directions from the end edges of the holder covers (14, 37) each have a taper shape, outer edge sections of taper surfaces of each of the guide sections (53, 54) are formed in such a manner as to protrude transversely outwards from surfaces of the guide sections (53, 54) where the holder covers (14, 37) are attached by an amount coinciding with a thickness of the holder covers (14, 37) or slightly more than the thickness, and the guide sections (53, 54) are configured so as to provide a state in which the outer edge sections of the respective taper surfaces of the guide sections (53, 54) cover the end edges of the holder covers (14, 37) as viewed from the attaching and detaching directions of the tape feeder, characterized in that the guide sections (53, 54) are attached to both end portions of the reel holder in the attaching and detaching directions in an exchangeable manner. a feeder main body; a reel holder configured to load a tape reel around which a component supply tape is wound; a reel displacement mechanism (41, 42) for holding the reel holder in such a manner as to be displaced in a width direction thereof relative to the feeder main body; a holder cover (14, 37) of sheet metal which is attached to at least a part of a side surface of the reel holder; and guide sections (53, 54) provided at both end portions of the reel holder in attaching and detaching directions to guide the tape feeder when the tape feeder is attached to or detached from the feeder setting section in such manner that end edges in the attaching and detaching directions of the holder cover (14, 37) of the tape feeder are not caught by an adjacent tape feeder, wherein respective portions of the guide sections (53, 54) that project in the attaching and detaching directions from the end edges of the holder covers (14, 37) each have a taper shape, outer edge sections of taper surfaces of each of the guide sections (53, 54) are formed in such a manner as to protrude transversely outwards from surfaces of the guide sections (53, 54) where the holder covers (14, 37) are attached by an amount coinciding with a thickness of the holder covers (14, 37) or slightly more than the thickness, and the guide sections (53, 54) are configured so as to provide a state in which the outer edge sections of the respective taper surfaces of the guide sections (53, 54) cover the end edges of the holder covers (14, 37) as viewed from the attaching and detaching directions of the tape feeder, characterized in that the guide sections (53, 54) are attached to both end portions of the reel holder in the attaching and detaching directions in an exchangeable manner.