An oil application device includes an oil supply member capable of selectively supplying oil to a first lateral surface and a second lateral surface of a flat wire. The oil supply member includes a first side surface and a second side surface. A part of the first side surface is a first application surface that is in contact with a part of the first lateral surface. Another part of the first side surface is a first non-application surface spaced apart from the first lateral surface. A part of the second side surface is a second application surface that is in contact with a part of the second lateral surface. Another part of the second side surface is a second non-application surface spaced apart from the second lateral surface.

An oil application device includes an oil supply member capable of selectively supplying oil to a first lateral surface and a second lateral surface of a flat wire. The oil supply member includes a first side surface and a second side surface. A part of the first side surface is a first application surface that is in contact with a part of the first lateral surface. Another part of the first side surface is a first non-application surface spaced apart from the first lateral surface. A part of the second side surface is a second application surface that is in contact with a part of the second lateral surface. Another part of the second side surface is a second non-application surface spaced apart from the second lateral surface.

An oil application device includes an oil supply member capable of selectively supplying oil to a first lateral surface and a second lateral surface of a flat wire. The oil supply member includes a first side surface and a second side surface. A part of the first side surface is a first application surface that is in contact with a part of the first lateral surface. Another part of the first side surface is a first non-application surface spaced apart from the first lateral surface. A part of the second side surface is a second application surface that is in contact with a part of the second lateral surface. Another part of the second side surface is a second non-application surface spaced apart from the second lateral surface.

An oil application device includes an oil supply member capable of selectively supplying oil to a first lateral surface and a second lateral surface of a flat wire. The oil supply member includes a first side surface and a second side surface. A part of the first side surface is a first application surface that is in contact with a part of the first lateral surface. Another part of the first side surface is a first non-application surface spaced apart from the first lateral surface. A part of the second side surface is a second application surface that is in contact with a part of the second lateral surface. Another part of the second side surface is a second non-application surface spaced apart from the second lateral surface.