A wiper apparatus (10; 110; 210) comprising: a wiper blade (20; 120; 220) for wiping a windshield (11; 111; 211); a connecting portion (37; 137; 237) disposed on the wiper blade; an arm piece (33; 133; 233) having a front end side fitted to the connecting portion; a retainer (32; 132; 232) fixed to a base end side of the arm piece; and a nozzle unit (34; 134; 234) fixed to the arm piece, the nozzle unit jetting washer fluid toward the windshield, characterized in that: the nozzle unit includes a forward-side block (35; 135; 235) and a backward-side block (36; 136; 236), the forward-side block has a forward-side nozzle cap (35f; 135f; 240); wherein the base end side of the forward-side block is provided with a forward-side first wall directed to the base end side of the wiper blade in the longitudinal direction; the front end side of the forward-side block is integrally provided with a forward-side arm; the forward-side arm is provided with a forward-side second wall directed to the front end side of the wiper blade in the longitudinal direction; a forward-side counter surface is provided between the forward-side first wall and the forward-side second wall of the forward-side block; and in the forward-side counter surface, a portion closer to the forward-side second wall is provided with the forward-side nozzle cap, the backward-side block has a backward-side nozzle cap (36f; 136f; 250); wherein on the base end side of the backward-side block, a backward-side first wall is formed, which is directed to the base end side of the wiper blade in the longitudinal direction; on the front end side of the backward-side block, a backward-side arm is formed integrally thereon; the backward-side arm has a backward-side second wall directed to the front end side of the wiper blade in the longitudinal direction; between the backward-side first wall and the backward-side second wall of the backward-side block, a backward-side counter surface is formed; and on a portion of the backward-side counter surface which is closer to the backward-side first wall, the backward-side nozzle cap is disposed, and an injection-target location of washer fluid jetted from the forward-side nozzle and an injection-target location of washer fluid jetted from the backward-side nozzle are shifted to each other in a longitudinal direction of the wiper blade. a wiper blade (20; 120; 220) for wiping a windshield (11; 111; 211); a connecting portion (37; 137; 237) disposed on the wiper blade; an arm piece (33; 133; 233) having a front end side fitted to the connecting portion; a retainer (32; 132; 232) fixed to a base end side of the arm piece; and a nozzle unit (34; 134; 234) fixed to the arm piece, the nozzle unit jetting washer fluid toward the windshield, the nozzle unit includes a forward-side block (35; 135; 235) and a backward-side block (36; 136; 236), the forward-side block has a forward-side nozzle cap (35f; 135f; 240); wherein the base end side of the forward-side block is provided with a forward-side first wall directed to the base end side of the wiper blade in the longitudinal direction; the front end side of the forward-side block is integrally provided with a forward-side arm; the forward-side arm is provided with a forward-side second wall directed to the front end side of the wiper blade in the longitudinal direction; a forward-side counter surface is provided between the forward-side first wall and the forward-side second wall of the forward-side block; and in the forward-side counter surface, a portion closer to the forward-side second wall is provided with the forward-side nozzle cap, the backward-side block has a backward-side nozzle cap (36f; 136f; 250); wherein on the base end side of the backward-side block, a backward-side first wall is formed, which is directed to the base end side of the wiper blade in the longitudinal direction; on the front end side of the backward-side block, a backward-side arm is formed integrally thereon; the backward-side arm has a backward-side second wall directed to the front end side of the wiper blade in the longitudinal direction; between the backward-side first wall and the backward-side second wall of the backward-side block, a backward-side counter surface is formed; and on a portion of the backward-side counter surface which is closer to the backward-side first wall, the backward-side nozzle cap is disposed, and an injection-target location of washer fluid jetted from the forward-side nozzle and an injection-target location of washer fluid jetted from the backward-side nozzle are shifted to each other in a longitudinal direction of the wiper blade.