Abstract: A bar loader for feeding a bar to a bar machining apparatus comprises a feeding rod for moving the bar and a guide rail for guiding the bar. The guide rail includes a guide rail body with an upper opening for receiving the bar and a lid member for covering the upper opening of the guide rail body and is operable to be opened and closed. A bar passageway formed between the guide rail body and the lid member has an inner wall surface. A plurality of oil grooves are formed on the inner wall surface which extend in a circumferential direction and arranged at a distance from each other in a longitudinal direction of the guide rail. It also has oil supplying system for supplying oil into the bar passageway.