Load-detecting device for properly detecting a load and suppressing deterioration of detection accuracy

A load-detecting device configured to be pressed by a seat cushion disposed on a plurality of S springs, the load-detecting device comprising:

• a base including a pair of engagement parts engaged with a pair of the S springs;
• and
• a load detection sensor unit that is mounted on the base and includes a pair of electrodes, the electrodes facing each other and being brought into contact with each other by pressing force of the seat cushion when a load is detected, wherein
• a pressed surface of the load detection sensor unit that is pressed by the seat cushion when a load is detected is located at the same height as or higher than upper ends of the respective S springs, with which the base is engaged, and
• a contact surface directly between the electrodes in pair is located lower than the upper ends of the respective S springs, with which the base is engaged,
• wherein the pressed surface when a load is not detected is located at the same height as or lower than upper ends of the pair of engagement parts.