A magnetic pump, comprising: a front casing for forming an interior pump space and having an inlet for drawing in a fluid to be pumped and an outlet for discharging said fluid; a rear casing for forming a cylindrical space extending from said pump space; a supporting shaft arranged in said cylindrical space and having a rear end supported by a rear end of said rear casing and a front end facing to said pump space; a totally cylindrical magnetic can rotatably supported by said supporting shaft and having an inner circumference on which a cylindrical rotary bearing is mounted and on outer circumference on which a driven magnet is mounted; an impeller secured on a front end of said magnetic can and accommodated in said pump space so as to rotate integrally with said magnetic can; a rotary driving means magnetically coupled to said driven magnet via said rear casing for supplying a rotary drying force to said impeller via said driven magnet; a rear bearing arranged at a rear end of said rotary bearing; and a rear thrust bearing arranged at a position opposite to said rear bearing of said rear casing for contacting said rear bearing when said rotary bearing moves backward during an abnormal run of said pump, characterized in that said magnetic can and said impeller are fitted with each other in the axial direction and coupled by a pin passing through both in the radial direction and in that said magnetic can is composed of a metallic cylinder which is resin coated on inner and outer circumferences thereof, and wherein a press-fitted portion of said impeller into said magnetic can is sandwiched between said metallic cylinder and said rotary bearing. a front casing for forming an interior pump space and having an inlet for drawing in a fluid to be pumped and an outlet for discharging said fluid; a rear casing for forming a cylindrical space extending from said pump space; a supporting shaft arranged in said cylindrical space and having a rear end supported by a rear end of said rear casing and a front end facing to said pump space; a totally cylindrical magnetic can rotatably supported by said supporting shaft and having an inner circumference on which a cylindrical rotary bearing is mounted and on outer circumference on which a driven magnet is mounted; an impeller secured on a front end of said magnetic can and accommodated in said pump space so as to rotate integrally with said magnetic can; a rotary driving means magnetically coupled to said driven magnet via said rear casing for supplying a rotary drying force to said impeller via said driven magnet; a rear bearing arranged at a rear end of said rotary bearing; and a rear thrust bearing arranged at a position opposite to said rear bearing of said rear casing for contacting said rear bearing when said rotary bearing moves backward during an abnormal run of said pump, characterized in that said magnetic can and said impeller are fitted with each other in the axial direction and coupled by a pin passing through both in the radial direction and in that said magnetic can is composed of a metallic cylinder which is resin coated on inner and outer circumferences thereof, and wherein a press-fitted portion of said impeller into said magnetic can is sandwiched between said metallic cylinder and said rotary bearing.