An instrument pedal device (10, 100, 140, 150) comprising: a base part (20, 110) placed on a floor; a pedal (30, 120), a first end side of the pedal (30, 120) is rotatably supported on the base part (20, 110) by a first shaft in a rotatable range of an initial position to a lowermost position; a rotation part (40, 152) rotatably supported on the base part (20, 110) by a second shaft (12, 151) parallel to the first shaft; a connection part (50, 153) rotatably supported on a second end side of the pedal (30, 120) by a third shaft parallel to the first shaft, and rotatably supported on the rotation part (40, 152) by a fourth shaft parallel to the first shaft; and a biasing member applying an urging force to the pedal (30, 120) that has rotated from the initial position to return to the initial position, wherein the second shaft (12, 151), the third shaft, and the fourth shaft are included in the same plane at the lowermost position, and wherein the urging force of the biasing member becomes larger as the pedal (30, 120) becomes closer to the lowermost position from the initial position, the instrument pedal device (10, 100, 140, 150) being characterized in further comprising: a pedal sensor (72, 132) that receives a pressing force from the pedal (30, 120) during rotation from the initial position to the lowermost position and detects an operation state of the pedal (30, 120); and an elastic body that allows rotation of the pedal (30, 120) to the lowermost position from a state in which a pressing force from the pedal (30, 120) is applied to the pedal sensor (72, 132) according to elastic deformation; wherein the elastic body includes a first buffer component positioned between the pedal (30, 120) and the pedal sensor (72, 132), and a second buffer component positioned between the pedal sensor (72, 132) and the base part (20, 110). a base part (20, 110) placed on a floor; a pedal (30, 120), a first end side of the pedal (30, 120) is rotatably supported on the base part (20, 110) by a first shaft in a rotatable range of an initial position to a lowermost position; a rotation part (40, 152) rotatably supported on the base part (20, 110) by a second shaft (12, 151) parallel to the first shaft; a connection part (50, 153) rotatably supported on a second end side of the pedal (30, 120) by a third shaft parallel to the first shaft, and rotatably supported on the rotation part (40, 152) by a fourth shaft parallel to the first shaft; and a biasing member applying an urging force to the pedal (30, 120) that has rotated from the initial position to return to the initial position, wherein the second shaft (12, 151), the third shaft, and the fourth shaft are included in the same plane at the lowermost position, and wherein the urging force of the biasing member becomes larger as the pedal (30, 120) becomes closer to the lowermost position from the initial position, the instrument pedal device (10, 100, 140, 150) being characterized in further comprising: a pedal sensor (72, 132) that receives a pressing force from the pedal (30, 120) during rotation from the initial position to the lowermost position and detects an operation state of the pedal (30, 120); and an elastic body that allows rotation of the pedal (30, 120) to the lowermost position from a state in which a pressing force from the pedal (30, 120) is applied to the pedal sensor (72, 132) according to elastic deformation; wherein the elastic body includes a first buffer component positioned between the pedal (30, 120) and the pedal sensor (72, 132), and a second buffer component positioned between the pedal sensor (72, 132) and the base part (20, 110). a pedal sensor (72, 132) that receives a pressing force from the pedal (30, 120) during rotation from the initial position to the lowermost position and detects an operation state of the pedal (30, 120); and an elastic body that allows rotation of the pedal (30, 120) to the lowermost position from a state in which a pressing force from the pedal (30, 120) is applied to the pedal sensor (72, 132) according to elastic deformation; wherein the elastic body includes a first buffer component positioned between the pedal (30, 120) and the pedal sensor (72, 132), and a second buffer component positioned between the pedal sensor (72, 132) and the base part (20, 110).