A wiper arm, comprising: an arm head; a shank, comprising: a pair of side walls (12a, 12b) connected to a tip end of the arm head and facing each other; and a top wall connected to an upper end part of each of the side walls (12a, 12b); a tube (20, 21) disposed inside the shank; the wiper arm being characterised in that the shank further comprises: a bottom cover joined to a lower end part of each of the side walls (12a, 12b) and facing the top wall, wherein the bottom cover comprises: a body part in a plate shape; and a holding part which is provided in a protruding way on an edge of a hole part formed in the body part in a width direction of the shank and which holds the tube (20, 21), and the holding part comprises: a first wall part which is provided at the edge and which protrudes toward the top wall; and a second wall part which is connected to the first wall part and which is disposed above the hole part. an arm head; a shank, comprising: a pair of side walls (12a, 12b) connected to a tip end of the arm head and facing each other; and a top wall connected to an upper end part of each of the side walls (12a, 12b); a pair of side walls (12a, 12b) connected to a tip end of the arm head and facing each other; and a top wall connected to an upper end part of each of the side walls (12a, 12b); a tube (20, 21) disposed inside the shank; the wiper arm being characterised in that the shank further comprises: a bottom cover joined to a lower end part of each of the side walls (12a, 12b) and facing the top wall, wherein the bottom cover comprises: a body part in a plate shape; and a holding part which is provided in a protruding way on an edge of a hole part formed in the body part in a width direction of the shank and which holds the tube (20, 21), and the holding part comprises: a first wall part which is provided at the edge and which protrudes toward the top wall; and a second wall part which is connected to the first wall part and which is disposed above the hole part. a bottom cover joined to a lower end part of each of the side walls (12a, 12b) and facing the top wall, wherein the bottom cover comprises: a body part in a plate shape; and a holding part which is provided in a protruding way on an edge of a hole part formed in the body part in a width direction of the shank and which holds the tube (20, 21), and the holding part comprises: a first wall part which is provided at the edge and which protrudes toward the top wall; and a second wall part which is connected to the first wall part and which is disposed above the hole part. a body part in a plate shape; and a holding part which is provided in a protruding way on an edge of a hole part formed in the body part in a width direction of the shank and which holds the tube (20, 21), and the holding part comprises: a first wall part which is provided at the edge and which protrudes toward the top wall; and a second wall part which is connected to the first wall part and which is disposed above the hole part. a first wall part which is provided at the edge and which protrudes toward the top wall; and a second wall part which is connected to the first wall part and which is disposed above the hole part.