A system for producing a raw material for a recycled resin composition, comprising: - a decomposition reaction apparatus for decomposing a thermosetting resin, comprising: an introduction section for introducing a resin composition containing the thermosetting resin and a solvent containing a monomer component of the thermosetting resin or a derivative of the monomer component; a decomposition reaction section for obtaining a first treated recovery product containing a recycled resin formed of the thermosetting resin having a reduced molecular weight, a solid residue and a low-boiling-point component containing the solvent, by heating and pressurizing the resin composition and the solvent and bringing the solvent into a supercritical state or a subcritical state, and the decomposition reaction section being comprised of a tube-type reactor which is adapted to perform the decomposition treatment with the resin composition and the solvent and is composed of a spirally in a vertical direction extending tubular body, and a discharge section for discharging the first treated recovery product, wherein the decomposition reaction apparatus is adapted to continuously perform the introduction of the resin composition and the solvent into the introduction section, the decomposition treatment of the thermosetting resin in the decomposition reaction section and the discharge of the first treated recovery product from the discharge section, - a first separating unit serving as a solid-liquid separator, wherein the first separating unit is designed for separating and removing the solid residue from the first treated recovery product, - a second separating unit serving as a gas-liquid separator, wherein the second separating unit is designed for separating and extracting the recycled resin as well as the low-boiling-point component containing the solvent from the first treated recovery product from which the solid residue has been removed, wherein the first separating unit and the second separating unit are connected to the discharge section of the decomposition reaction apparatus in the named sequence. - a decomposition reaction apparatus for decomposing a thermosetting resin, comprising: an introduction section for introducing a resin composition containing the thermosetting resin and a solvent containing a monomer component of the thermosetting resin or a derivative of the monomer component; a decomposition reaction section for obtaining a first treated recovery product containing a recycled resin formed of the thermosetting resin having a reduced molecular weight, a solid residue and a low-boiling-point component containing the solvent, by heating and pressurizing the resin composition and the solvent and bringing the solvent into a supercritical state or a subcritical state, and the decomposition reaction section being comprised of a tube-type reactor which is adapted to perform the decomposition treatment with the resin composition and the solvent and is composed of a spirally in a vertical direction extending tubular body, and a discharge section for discharging the first treated recovery product, wherein the decomposition reaction apparatus is adapted to continuously perform the introduction of the resin composition and the solvent into the introduction section, the decomposition treatment of the thermosetting resin in the decomposition reaction section and the discharge of the first treated recovery product from the discharge section, an introduction section for introducing a resin composition containing the thermosetting resin and a solvent containing a monomer component of the thermosetting resin or a derivative of the monomer component; a decomposition reaction section for obtaining a first treated recovery product containing a recycled resin formed of the thermosetting resin having a reduced molecular weight, a solid residue and a low-boiling-point component containing the solvent, by heating and pressurizing the resin composition and the solvent and bringing the solvent into a supercritical state or a subcritical state, and the decomposition reaction section being comprised of a tube-type reactor which is adapted to perform the decomposition treatment with the resin composition and the solvent and is composed of a spirally in a vertical direction extending tubular body, and a discharge section for discharging the first treated recovery product, wherein the decomposition reaction apparatus is adapted to continuously perform the introduction of the resin composition and the solvent into the introduction section, the decomposition treatment of the thermosetting resin in the decomposition reaction section and the discharge of the first treated recovery product from the discharge section, - a first separating unit serving as a solid-liquid separator, wherein the first separating unit is designed for separating and removing the solid residue from the first treated recovery product, - a second separating unit serving as a gas-liquid separator, wherein the second separating unit is designed for separating and extracting the recycled resin as well as the low-boiling-point component containing the solvent from the first treated recovery product from which the solid residue has been removed, wherein the first separating unit and the second separating unit are connected to the discharge section of the decomposition reaction apparatus in the named sequence.