To provide a boat davit for allowing a boat to be safely lifted up and down from a ship even during the operation of the ship, and enabling the boat to be easily replaced with another one different in size.

A boat davit includes a pair of boat supporting arms 2 erected on a deck 1 at a distance from each other, ropes 4 to be moved via pulleys 3 at the front ends of the arms 2, a winch 5 for operating the ropes 4, and a cradle 7. Launching strops 15 are adjusted to put a side face 17 of the boat 9 in contact with the cradle 7, and a fender is laid on the contact surface.