To provide a hinge structure for a vessel which is reduced in shear force locally applied to the hinge shaft to prevent the hinge shaft from damage.

This is a hinge structure for a vessel 1. A projection part 12 with a tapered peripheral face projected from the end face 7a of a hinge piece 7. A dent part 10 is formed on the end face 3a of a hinge piece 3. A notch part 13 with a bending piece 14 bendable and displaceable to the axial center direction of the hinge shaft 9 is formed on the end part of the hinge piece 7. The bending piece 14 is enabled to slide against the hinge shaft 9 so as to be bent deformed toward the axial direction of the hinge shaft to be the direction to detach the fitting between the projecting part and the dent part by action of external force. The shaft hole 4 on the bottom part of the dent part 10 and the shaft hole 6 on the top part of the projecting part 12 are separated by the bending deformation to lower shear force applied on a bridged part of the hinge shaft 9 bridged between the shaft hole 4 and the shaft hole 6 to prevent the hinge shaft from destruction.