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A vapor-phase process apparatus and a vapor-phase process method capable of satisfactorily maintaining quality of processes even when different types of processes are performed are obtained. A vapor-phase process apparatus includes a process chamber, gas supply ports serving as a plurality of gas in

A vapor-phase process apparatus and a vapor-phase process method capable of satisfactorily maintaining quality of processes even when different types of processes are performed are obtained. A vapor-phase process apparatus includes a process chamber, gas supply ports serving as a plurality of gas introduction portions, and a gas supply portion (a gas supply member, a pipe, a flow rate control device, a pipe, and a buffer chamber). The process chamber allows flow of a reaction gas therein. The plurality of gas supply ports are formed in a wall surface (upper wall) of the process chamber along a direction of flow of the reaction gas. The gas supply portion can supply a gas into the process chamber at a different flow rate from each of one gas supply port and another gas supply port different from that one gas supply port among the plurality of gas supply ports.

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1. A vapor-phase process apparatus, comprising: a process chamber in which a reaction gas flows;a plurality of gas introduction portions formed in a wall portion of said process chamber along a direction of flow of said reaction gas; anda flow-guide plate formed to cover said gas introduction portio

1. A vapor-phase process apparatus, comprising: a process chamber in which a reaction gas flows;a plurality of gas introduction portions formed in a wall portion of said process chamber along a direction of flow of said reaction gas; anda flow-guide plate formed to cover said gas introduction portion in said process chamber and guiding a gas supplied from said gas introduction portion into said process chamber such that the gas flows in a direction along the direction of flow of said reaction gas,said flow-guide plate being formed in the wall portion of said process chamber where said gas introduction portions are formed, to extend in a direction of width intersecting the direction of flow of said reaction gas,a plurality of the gas introduction portions are formed in the direction of width,said flow-guide plate covers the plurality of gas introduction portions formed in the direction of width and the flow-guide plate is formed apart from a surface of the wall portion of the process chamber, anda clearance between the flow-guide plate and the surface of the wall portion constitutes a flow path of the gas supplied from the gas introduction portion. 2. The vapor-phase process apparatus according to claim 1, wherein said flow-guide plate has a length in said direction of width equal to a length of said process chamber in said direction of width. 3. The vapor-phase process apparatus according to claim 1, wherein a plurality of said gas introduction portions are formed in said direction of width, anda size of said flow-guide plate and arrangement of said gas introduction portions are determined to satisfy relation of L/PH≧20 where L represents a distance from a rear end of said gas introduction portion to a rear end of said flow-guide plate in the direction of flow of said reaction gas, H represents a distance between said wall portion opposed to said flow-guide plate and said flow-guide plate, and P represents a distance between said gas introduction portions adjacent in said direction of width. 4. The vapor-phase process apparatus according to claim 1, wherein said gas introduction portion includesa gas introduction hole formed in said wall portion, anda buffer chamber connected to said gas introduction hole and having a width greater than a width of said gas introduction hole. 5. The vapor-phase process apparatus according to claim 1, wherein a rear end portion of said flow-guide plate in the direction of flow of said reaction gas has a wedge-shaped cross-section along the direction of flow of said reaction gas, andan angle formed by an angled portion in the cross-section of said rear end portion is not greater than 90°. 6. The vapor-phase process apparatus according to claim 1, further comprising a gas supply portion capable of supplying the gas into said process chamber at a different flow rate from each of one gas introduction portion and another gas introduction portion different from said one gas introduction portion among said plurality of gas introduction portions. 7. The vapor-phase process apparatus according to claim 1, wherein a distance between other wall portion opposed to the wall portion of said process chamber where said gas introduction portions are formed and said flow-guide plate is smaller toward downstream in the direction of flow of said reaction gas. 8. The vapor-phase process apparatus according to claim 1, further comprising a susceptor holding a process object in said process chamber, wherein regarding a distance between other wall portion of said process chamber opposed to the wall portion where said gas introduction portions are formed and said flow-guide plate, said distance at an upstream end of said susceptor in the direction of flow of said reaction gas is smaller than said distance at a central portion of said susceptor in the direction of flow of said reaction gas.