A printer has an automatic cutter and a recording paper guide member. The automatic cutter includes a fixed knife attached to the printer case and a movable knife attached to an access cover. The movable knife is attached to the open side of the access cover relative to the fixed knife. The recording paper guide member is disposed to the printer case at a position closer to the open side of the access cover than the movable knife. The movable knife protruding to the fixed knife side and the recording paper guide member interfere if the access cover is opened when the movable knife has moved to the cutting start position. As a result, because movement of the access cover is limited and the access cover will not open, the movable knife protruding to the fixed knife side is not exposed outside the printer case.