A steam stripping apparatus comprising at least one cylindrical upright crumbing tank which desolvates a rubber-like polymer solution or slurry by means of steam, and which recovers a rubber-like polymer, wherein: at least a first tank among the crumbing tanks comprises: a stir shaft which extends in a cylindrical upright direction, and which rotates in an axial direction; and an impeller that extends from a center of the stir shaft in a direction of an inner wall face of the crumbing tank; the impeller includes a knife blade; the knife blade has a cutting edge with an edge angle between 10 and 60 degrees that faces in a rotational direction of the stir; a ratio of a length of twice a distance between a tip of the cutting edge of the knife blade and a center of a cross section of the stir shaft that is on a same plane as the knife blade with respect to an inside diameter of the crumbing tank is between 30 and 70%; at least the first tank among the crumbing tanks comprises a baffle plate arranged on an inner wall face of the crumbing tank; the baffle plate has an approximately triangular cross-sectional shape having, on a cross section in a cylindrical lateral direction of the crumbing tank, a side face on each of an upstream side and a downstream side with respect to a flow direction of a fluid inside the crumbing tank, and in which the upstream-side side face and the downstream-side side face meet to form an intersection point; an angle of the baffle plate that is formed by a line segment of the upstream-side side face on a cross section in a cylindrical lateral direction of the crumbing tank and a line segment that connects to an intersection point from the center of the stir shaft is between 30 and 75 degrees; and an angle of the baffle plate formed by a line segment of the downstream-side side face on a cross section in a cylindrical lateral direction of the crumbing tank and the line segment that connects to an intersection point from the center of the stir shaft is between 30 and 75 degrees. at least a first tank among the crumbing tanks comprises: a stir shaft which extends in a cylindrical upright direction, and which rotates in an axial direction; and an impeller that extends from a center of the stir shaft in a direction of an inner wall face of the crumbing tank; the impeller includes a knife blade; the knife blade has a cutting edge with an edge angle between 10 and 60 degrees that faces in a rotational direction of the stir; a ratio of a length of twice a distance between a tip of the cutting edge of the knife blade and a center of a cross section of the stir shaft that is on a same plane as the knife blade with respect to an inside diameter of the crumbing tank is between 30 and 70%; at least the first tank among the crumbing tanks comprises a baffle plate arranged on an inner wall face of the crumbing tank; the baffle plate has an approximately triangular cross-sectional shape having, on a cross section in a cylindrical lateral direction of the crumbing tank, a side face on each of an upstream side and a downstream side with respect to a flow direction of a fluid inside the crumbing tank, and in which the upstream-side side face and the downstream-side side face meet to form an intersection point; an angle of the baffle plate that is formed by a line segment of the upstream-side side face on a cross section in a cylindrical lateral direction of the crumbing tank and a line segment that connects to an intersection point from the center of the stir shaft is between 30 and 75 degrees; and an angle of the baffle plate formed by a line segment of the downstream-side side face on a cross section in a cylindrical lateral direction of the crumbing tank and the line segment that connects to an intersection point from the center of the stir shaft is between 30 and 75 degrees.