To provide a method for producing a race track-type metal honeycomb body excluding an outer cylinder in combination with a diffusion joining method and a method for producing a race track-type metal carrier including the outer cylinder.

Metallic flat foil and corrugated foil are alternately wound to form the cylindrical honeycomb body 1 having a hollow part 8. The cylindrical honeycomb body 1 having the hollow part with the axis of the cylinder horizontalized is then heat-treated in vacuum, hence the hollow part 8 is collapsed by the gravity of the honeycomb body 1, and the contact parts of the flat foil and corrugated foil are diffusion-joined. More preferably, a weight is placed on the upper part of the honeycomb body 1 in addition to the gravity of the honeycomb body 1 to collapse the hollow part 8.