A bicycle shifter includes a base having an annular space and first teeth and second teeth defined in the annular space. The toner image conveyer unit includes a toner image conveyer, a supporting member that detachably supports the toner image conveyer, and a detecting member that detects a toner image on the toner image conveyer. The large-diameter passage is formed on the opening side of the fluid passage and connected to the small-diameter passage. By applying the optimized blend, material and labor costs associated with well operation can be significantly reduced.