A combustion chamber assembly, especially for a vehicle heater, includes a combustion chamber housing (12) with a housing wall (16) surrounding a combustion chamber. At least one ignition element opening (28) is provided in the area of the housing wall (16) and an ignition element (30) is fixed in a fastening area (44) in at least one ignition element opening (28). The at least one ignition element opening (28) is designed with a circular wedge inner profile (54) and the fastening area of the ignition element fastened in this opening is designed with a circular wedge outer profile and fasteningly meshes with the circular wedge inner profile (54).