Sensor disposition structure in seat

A sensor disposition structure in a seat, comprising:

• a cushion pad;
• and
• a board-shaped member which is disposed under the cushion pad,
• wherein,
• a concave is formed in an upper surface of the board-shaped member,
• a sensor is disposed in the concave,
• a nail unit as a first engaging unit is formed in a nail shape and is formed in the concave,
• the nail unit is formed in a shape protruding from the concave,
• the nail unit is positioned in a position so as to engage with an engaging part of the sensor,
• the sensor is disposed in the concave in a state being fixed to an attachment bracket,
• the attachment bracket is attached to the concave in a state engaged to the first engaging unit provided in the concave, and
• a rib is formed in the concave in a position so as to overlap with the attachment bracket in an up and down direction.