| 摘要 |
The generation of a casting defect is suppressed which would otherwise occur to frame members of a seat frame when being formed of a magnesium alloy or an aluminum alloy by casting. The seat frame (100) according to the present invention is for a saddle-riding type transporter (200), and includes a pair of frame members (10L,10R) formed of a magnesium alloy or an aluminum alloy by casting. The pair of frame members (10L,10R) each include a first side wall (11), a second side wall (12) located outer with respect to the first side wall (11) in a vehicle width direction (B), and a connecting wall (13) for connecting the first side wall (11) and the second side wall (12) to each other. The connecting wall (13) includes seat fixing section (13a,13b,13c) for fixing a seat (136,139). The pair of frame members (10L,10R) each include a first region (R1) in which a top end of the first side wall (11) and a top end of the second side wall (12) are connected to each other by the connecting wall (13), and a second region (R2) in which a portion below the top end of the first side wall (11) and a portion below the top end of the second side wall (12) are connected to each other by the connecting wall (13). The seat fixing section (13a,13b,13c) is located in the first region (R1).
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