Patent ID: 8758511

Claim:
A film forming apparatus comprising: a source material supply unit for supplying source material of liquid or gas-liquid mixture; a source material vaporizing unit for generating a source gas by vaporizing the source material; and a film forming unit for performing a film formation by using the generated source gas, wherein a filter is installed in a transport path of the source gas extending from the source material vaporizing unit to an introduction portion of the film forming unit, wherein an outer peripheral portion of the filter is pressed over an entire perimeter thereof against an inner surface of the transport path by an annular supporting member that is not deformed more easily than the outer peripheral portion by a load imposed in a pressing direction, so that the outer peripheral portion is fixed to the inner surface of the transport path while being compressed between the inner surface of the transport path and the supporting member, wherein the outer peripheral portion of the filter includes a recess or a protrusion, as viewed from a cross section in a diametrical direction of the filter, wherein a surface of the supporting member in contact with the outer peripheral portion of the filter includes a recess or a protrusion, as viewed from the cross section in the diametrical direction of the filter, the recess or the protrusion of the supporting member being in firm contact with the outer peripheral portion of the filter, and wherein the inner surface of the transport path in contact with the outer peripheral portion of the filter includes a recess or a protrusion, as viewed from the cross section in the diametrical direction of the filter, the recess or the protrusion of the transport path being in firm contact with the outer peripheral portion of the filter.