An apparatus for producing trichlorosilane, comprising: a reaction vessel in which a supply gas containing silicon tetrachloride and hydrogen is supplied to an internal reaction passageway to produce a reaction product gas containing trichlorosilane and hydrogen chloride; a heating mechanism having a heater that heats the interior of the reaction vessel; a gas supply section that supplies the supply gas in the reaction vessel; and a gas discharge section that discharges the reaction product gas from the reaction vessel to the outside, wherein the heater is disposed in the center of the reaction vessel, and the reaction passageway is disposed in the periphery of the heater, wherein a plurality of cylindrical reaction tubular walls having different inner diameters are concentrically disposed in the reaction vessel and partition a majority of the internal space of the reaction vessel into a central columnar space and a plurality of tubular spaces in the periphery thereof, the heater is formed of carbon and stored inside the innermost reaction tubular wall, and the reaction passageway includes the plurality of reaction tubular spaces, wherein the reaction passageway includes: a supply side passageway which is connected to the gas supply section and flows the supply gas toward the center side from the outer circumference side of the reaction vessel; and a discharge side passageway that includes an upstream end connected to the supply side passageway and a downstream end connected to the gas discharge section, and flows the reaction product gas produced from the supply gas toward the outer circumference side from the center side of the reaction vessel, and the supply side passageway and the discharge side passageway are disposed adjoining each other. a reaction vessel in which a supply gas containing silicon tetrachloride and hydrogen is supplied to an internal reaction passageway to produce a reaction product gas containing trichlorosilane and hydrogen chloride; a heating mechanism having a heater that heats the interior of the reaction vessel; a gas supply section that supplies the supply gas in the reaction vessel; and a gas discharge section that discharges the reaction product gas from the reaction vessel to the outside, wherein the heater is disposed in the center of the reaction vessel, and the reaction passageway is disposed in the periphery of the heater, wherein a plurality of cylindrical reaction tubular walls having different inner diameters are concentrically disposed in the reaction vessel and partition a majority of the internal space of the reaction vessel into a central columnar space and a plurality of tubular spaces in the periphery thereof, the heater is formed of carbon and stored inside the innermost reaction tubular wall, and the reaction passageway includes the plurality of reaction tubular spaces, wherein the reaction passageway includes: a supply side passageway which is connected to the gas supply section and flows the supply gas toward the center side from the outer circumference side of the reaction vessel; and a discharge side passageway that includes an upstream end connected to the supply side passageway and a downstream end connected to the gas discharge section, and flows the reaction product gas produced from the supply gas toward the outer circumference side from the center side of the reaction vessel, and the supply side passageway and the discharge side passageway are disposed adjoining each other. a supply side passageway which is connected to the gas supply section and flows the supply gas toward the center side from the outer circumference side of the reaction vessel; and a discharge side passageway that includes an upstream end connected to the supply side passageway and a downstream end connected to the gas discharge section, and flows the reaction product gas produced from the supply gas toward the outer circumference side from the center side of the reaction vessel, and the supply side passageway and the discharge side passageway are disposed adjoining each other.