A wiper blade suitable to three types of wiper arms. A connector assembly of the wiper blade is detachably connected to wiper arms having first to third coupling units at a distal end respectively. The connector assembly has an adaptor and a slide cover slidably joined to the adaptor. The slide cover is moved to the adaptor in a first movement direction to fix the first to third coupling units to the adaptor and is moved from the adaptor in a second movement direction opposite to the first movement direction to release fixation between the coupling units and the adaptor. The adaptor has a support protrusion supporting support surfaces of the first to third coupling units. The slide cover has a push surface contacting the contact surfaces of the first to third coupling units to push the first to third coupling units towards the support protrusion of the adaptor.