A washer nozzle, comprising: a supply port configured to receive supply of liquid; an oscillation chamber configured to oscillate the liquid supplied through the supply port; and a jetting section (23A to 23Q) configured to jet the liquid oscillated in the oscillation chamber to the outside, wherein the jetting section (23A to 23Q) includes a passage connecting the oscillation chamber and the outside, and includes: an entrance (31A to 31Q) where the liquid enters the passage from the oscillation chamber; an exit (32A to 32Q) where the liquid is emitted from the passage to the outside; a jet port (33A to 33Q) provided between the entrance (31A to 31Q) and the exit (32A to 32Q), having a narrower width than those of the entrance (31A to 31Q) and the exit (32A to 32Q); an outer guide (36A to 36Q) connecting the jet port (33A to 33Q) and the exit (32A to 32Q); and an inner guide (35A to 35Q) connecting the entrance (31A to 31Q) and the jet port (33A to 33Q), and configured to conduct the liquid oscillated in the oscillation chamber to the outer guide (36A to 36Q), characterized in that: the oscillation chamber is configured to advance the liquid along a reference axis, and to repeatedly and reciprocatedly change a travelling direction of the liquid within a range between first and second directions, an outer central line is not parallel with the reference axis, the outer central line bisects an outer development angle (θ 11 +θ 12) where a first outer line meets a second outer line, the first outer line connects an inner periphery (333; 337) of the jet port (33E; 33F; 33Q; 33H; 33J) and an inner periphery of the exit (32E; 32F; 32Q; 32H; 32J) in a side of the first direction, and the second outer line connects the inner periphery (334; 338) of the jet port (33E; 33F; 33Q; 33H; 33J) and an inner periphery of the exit (32E; 32F; 32Q; 32H; 32J) in a side of the second direction. a supply port configured to receive supply of liquid; an oscillation chamber configured to oscillate the liquid supplied through the supply port; and a jetting section (23A to 23Q) configured to jet the liquid oscillated in the oscillation chamber to the outside, an entrance (31A to 31Q) where the liquid enters the passage from the oscillation chamber; an exit (32A to 32Q) where the liquid is emitted from the passage to the outside; a jet port (33A to 33Q) provided between the entrance (31A to 31Q) and the exit (32A to 32Q), having a narrower width than those of the entrance (31A to 31Q) and the exit (32A to 32Q); an outer guide (36A to 36Q) connecting the jet port (33A to 33Q) and the exit (32A to 32Q); and an inner guide (35A to 35Q) connecting the entrance (31A to 31Q) and the jet port (33A to 33Q), and configured to conduct the liquid oscillated in the oscillation chamber to the outer guide (36A to 36Q), the oscillation chamber is configured to advance the liquid along a reference axis, and to repeatedly and reciprocatedly change a travelling direction of the liquid within a range between first and second directions, an outer central line is not parallel with the reference axis, the outer central line bisects an outer development angle (θ 11 +θ 12) where a first outer line meets a second outer line, the first outer line connects an inner periphery (333; 337) of the jet port (33E; 33F; 33Q; 33H; 33J) and an inner periphery of the exit (32E; 32F; 32Q; 32H; 32J) in a side of the first direction, and the second outer line connects the inner periphery (334; 338) of the jet port (33E; 33F; 33Q; 33H; 33J) and an inner periphery of the exit (32E; 32F; 32Q; 32H; 32J) in a side of the second direction.