Internal combustion engine and method of producing same

A method of producing an internal combustion engine by forming an anodic oxidation coating film on all or a portion of a wall facing a combustion chamber in the internal combustion engine, comprising:

• forming an anode by immersing all or a portion of the wall in an acidic electrolytic bath, forming a cathode within the acidic electrolytic bath, and then applying between the two electrodes a voltage adjusted to the range of 130 to 200 V for the maximum, and performing electrolysis at a heat removal rate adjusted to the range from 1.6 to 2.4 cal/s/cm2;
• and
• producing, on the surface of all or a portion of the wall, an anodic oxidation coating film having a structure provided with a bonding region and a nonbonding region, each of hollow cells in the bonding region being bonded to the adjacent hollow cells, and three or more adjacent hollow cells in the nonbonding region being not bonded to each other.