| 摘要 |
A rear arm 15 for a motorcycle obtained by weld-bonding left and right arm molded bodies 2 and 3 made of aluminum alloy die-cast, which are formed by dividing pivot sections 2 b and 3 b and cross member sections 2 c and 3 c into left and right parts along a body central line, in the pivot sections and the cross member sections is provided, in which left and the right arm sections 2 a and 3 a are formed in substantially a triangular shape in side view and formed in substantially C shape opening toward an inner side in a width direction of the vehicle in cross-sectional view, and the cross member sections 2 c and 3 c are formed in a closed sectional shape extending from vertexes 2 g and 3 g of the triangular shapes to bases thereof.
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