PURPOSE: To reduce the working man-hour by forming a head bolt hole formed on a cylinder head as a hole as cast during the casting.

CONSTITUTION: Water jacket cores 6 and air intake/exhaust port cores 5 of the prescribed number are arranged at the prescribed positions in a recessed part formed by a base core 3 and rail cores 4A, 4B to cover the upper part of the base core on each side, and cores 8 for the rod-shaped head bolt of the prescribed number to form the head bolt hole in the casting are positioned and locked by an upper lid core 7 across the rail cores 4A, 4B and the base cores 3. The cores 8 for the head bolt hole are set so as not to be interfered with the water jacket cores 6, and the mutual positional precision therebetween is improved, and the positional relationship between the water jacket of the cylinder head which is cast using this casting mold and the head bolt hole can be kept normal.