Provided is a thermal bonding sheet which suppresses a compositional material of the thermal bonding sheet from protruding during bonding and from creeping up onto the surface of an object to be bonded, and provides a strong sintered layer after sintering. A thermal bonding sheet includes a layer. When the layer is analyzed by a differential thermal balance from 23° C. to 500° C. in an air atmosphere at a heating rate of 10° C./min, a value obtained by subtracting a weight decrease amount (%) at 300° C. from a weight decrease amount (%) at 500° C. is in a range of −1% to 0%.