Wiring circuit board

A wiring circuit board comprising:

• a metal supporting board;
• an insulating layer;
• and a conductive layer in this order in a thickness direction,
• wherein the conductive layer includes a terminal portion, and a tail line portion extending from the terminal portion,
• the terminal portion having a first via portion that penetrates the insulating layer in the thickness direction and is connected to the metal supporting board,
• the tail line portion having a base end portion and a second via portion, the base end portion having a width different from a width of the terminal portion in a direction orthogonal to the extending direction of the tail line portion, the base end portion being connected to the terminal portion, the second via portion penetrating the insulating layer in the thickness direction and being connected to the metal supporting board, and
• the conductive layer includes two terminal portions, and the tail line portion extends from one terminal portion to the other terminal portion.

A wiring circuit board comprising:

• a metal supporting board;
• an insulating layer;
• and a conductive layer in this order in a thickness direction,
• wherein the conductive layer includes a terminal portion, and a tail line portion extending from the terminal portion,
• the terminal portion having a first via portion that penetrates the insulating layer in the thickness direction and is connected to the metal supporting board,
• the tail line portion having a base end portion and a second via portion, the base end portion having a width different from a width of the terminal portion in a direction orthogonal to the extending direction of the tail line portion, the base end portion being connected to the terminal portion, the second via portion penetrating the insulating layer in the thickness direction and being connected to the metal supporting board,
• the terminal portion includes a first conductive layer on a side of the insulating layer, and a second conductive layer on the first conductive layer, and
• the material of the first conductive layer and the material of the second conductive layer are the same.