Provided is a timepiece part that reduces axial runout of a flat member when the rotating axle thereof turns. A escape wheel and pinion 18 includes an axle member having a first shaft 44 and a second shaft 45 that is larger in diameter than the first shaft, and a seat 48 disposed outside the position where the first shaft and the second shaft connect; a guide member 49 disposed in contact with the seat, having a first hole in which the first shaft is inserted, and having a diameter greater than the second shaft; an escape wheel 23 disposed in contact with the guide member and having a second hole in which the first shaft is inserted; and a fixing member 50 disposed in contact with the escape wheel, having a third hole in which the first shaft is inserted.