A foreign material removing device suitable to remove a foreign material located between a stock rail and a point rail of a track turnout portion, the foreign material removing device comprising: the stock rail, the point rail, and a piping unit (101; 101a) which includes a pipe (180, 180a) and a plurality of nozzle portions (110; 110a) which are configured to spray compressed air to remove the foreign material, wherein the pipe (180, 180a) extends along a concave portion of a lateral surface of the stock rail opposed to the point rail, wherein the plurality of nozzle portions (110; 110a) are arranged on the upper and lower surfaces of the pipe (180, 180a), wherein the piping unit (101; 101a) includes a first fixing member provided along a lower surface of first and second leg portions (501a, 501b) of the stock rail, and a second fixing member having a tapered surface provided on the upper surface of the first leg portion, and the first fixing member is fastened to a bottom surface of the stock rail, and the second fixing member is fastened to the upper surface of the first leg portion in a vertical direction, by a bolt, wherein a fixing portion of the first fixing member is provided on the upper surface of the second leg portion, and the fixing portion supports the pipe (180, 180a) by means of a third fixing member, whereby the third fixing member is sandwiched by the fixing portion and the second leg portion and is bent such that the pipe (180, 180a) is pressed against the concave portion of the lateral surface of the stock rail opposed to the point rail. the stock rail, the point rail, and a piping unit (101; 101a) which includes a pipe (180, 180a) and a plurality of nozzle portions (110; 110a) which are configured to spray compressed air to remove the foreign material, wherein the pipe (180, 180a) extends along a concave portion of a lateral surface of the stock rail opposed to the point rail, wherein the plurality of nozzle portions (110; 110a) are arranged on the upper and lower surfaces of the pipe (180, 180a), wherein the pipe (180, 180a) extends along a concave portion of a lateral surface of the stock rail opposed to the point rail, wherein the plurality of nozzle portions (110; 110a) are arranged on the upper and lower surfaces of the pipe (180, 180a), wherein the piping unit (101; 101a) includes a first fixing member provided along a lower surface of first and second leg portions (501a, 501b) of the stock rail, and a second fixing member having a tapered surface provided on the upper surface of the first leg portion, and the first fixing member is fastened to a bottom surface of the stock rail, and the second fixing member is fastened to the upper surface of the first leg portion in a vertical direction, by a bolt, a first fixing member provided along a lower surface of first and second leg portions (501a, 501b) of the stock rail, and a second fixing member having a tapered surface provided on the upper surface of the first leg portion, and the first fixing member is fastened to a bottom surface of the stock rail, and the second fixing member is fastened to the upper surface of the first leg portion in a vertical direction, by a bolt, wherein a fixing portion of the first fixing member is provided on the upper surface of the second leg portion, and the fixing portion supports the pipe (180, 180a) by means of a third fixing member, whereby the third fixing member is sandwiched by the fixing portion and the second leg portion and is bent such that the pipe (180, 180a) is pressed against the concave portion of the lateral surface of the stock rail opposed to the point rail.