Toyota Jidosha Kabushiki Kaisha

Yoshikazu Niimi

Takanori Kawashima

Masaya Kaji

Masatsugu Takarabe

A heat sink includes a flow path through which a cooling medium that cools a heat-producing body flows, the flow path having two flow path wall surfaces that face each other; and a plurality of columnar fins provided on one of the flow path wall surfaces, which is positioned at a side where the heat-producing body is provided, the plurality of columnar fins including a long columnar fin and a short columnar fin, and the other of the flow path wall surfaces having a recess in which a distal end portion of the long columnar fin is inserted.

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Miyoshi, Japan

Yoshikazu Niimi