| 摘要 |
PROBLEM TO BE SOLVED: To provide a weight sensor that can accurately measure weight even in the case of a sheet having a cushion spring in a cushion frame, has a simple, inexpensive control circuit, and cannot be easily affected by electromagnetic waves. SOLUTION: The weight sensor S is mounted to the cushion spring 2 that is arranged in the cushion frame 1 in the sheet, outputs the contraction/ expansion of the cushion spring 2 as a change in resistance, and comprises a first hook section 3 that is locked to the cushion spring, a second hook section 4 that is locked to the cushion frame, and a sensor section 5 that slidably supports the first hook section 3 and at the same time fixes the second hook section 4.
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