A method for producing high purity tin, comprising: a step of providing primary refined electrodeposited tin having improved purity on a surface of a cathode by carrying out electrolytic refining in an electrolytic bath partitioned into an anode chamber and a cathode chamber by disposing a diaphragm between an anode and a cathode, said electrolytic bath containing an sulfuric acidic solution of tin sulfate as an electrolytic solution and raw material tin as said anode, said raw material tin having a lead content of 20 ppm by mass or less, an iron content of 5 ppm by mass or less, a copper content of 0.5 ppm by mass or less, an antimony content of 5 ppm by mass or less and the total content of silver, arsenic, bismuth, cadmium, copper, iron, indium, nickel, lead, antimony and zinc of 30 ppm by mass or less, while adding to at least said cathode camber a smoothing agent for reducing a surface area of electrodeposited tin, wherein said step comprises withdrawing at least a part of said tin sulfate solution on said anode chamber side, removing lead and an oxide sludge in said withdrawn tin sulfate solution, and supplying said tin sulfate solution resulting from the removal of lead and the oxide sludge to said cathode chamber; a step of providing needle-like secondary refined electrodeposited tin on a surface of said cathode by carrying out electrolytic refining in an electrolytic bath containing said primary refined electrodeposited tin or cast tin resulting from heating, melting and casting of said primary refined electrodeposited tin as an anode and a hydrochloric acidic solution of tin chloride as an electrolytic solution, wherein said step comprises withdrawing at least a part of said tin chloride solution from said electrolytic bath, removing particles in said tin chloride solution and remaining components of said smoothing agent carried from the step, and then recycling to said electrolytic bath again said tin chloride solution from which said particles and said remaining components of said smoothing agent have been removed; and a step comprising melting and casting said needle-like secondary refined electrodeposited tin in a reducing gas atmosphere wherein the smoothing agent is a nonionic surfactant composed of a compound having a structure in which one or more hydroxyl groups are bonded to an aryl group(s) directly or via one or more methylene groups and/or one or more ethylene oxide groups. a step of providing primary refined electrodeposited tin having improved purity on a surface of a cathode by carrying out electrolytic refining in an electrolytic bath partitioned into an anode chamber and a cathode chamber by disposing a diaphragm between an anode and a cathode, said electrolytic bath containing an sulfuric acidic solution of tin sulfate as an electrolytic solution and raw material tin as said anode, said raw material tin having a lead content of 20 ppm by mass or less, an iron content of 5 ppm by mass or less, a copper content of 0.5 ppm by mass or less, an antimony content of 5 ppm by mass or less and the total content of silver, arsenic, bismuth, cadmium, copper, iron, indium, nickel, lead, antimony and zinc of 30 ppm by mass or less, while adding to at least said cathode camber a smoothing agent for reducing a surface area of electrodeposited tin, wherein said step comprises withdrawing at least a part of said tin sulfate solution on said anode chamber side, removing lead and an oxide sludge in said withdrawn tin sulfate solution, and supplying said tin sulfate solution resulting from the removal of lead and the oxide sludge to said cathode chamber; a step of providing needle-like secondary refined electrodeposited tin on a surface of said cathode by carrying out electrolytic refining in an electrolytic bath containing said primary refined electrodeposited tin or cast tin resulting from heating, melting and casting of said primary refined electrodeposited tin as an anode and a hydrochloric acidic solution of tin chloride as an electrolytic solution, wherein said step comprises withdrawing at least a part of said tin chloride solution from said electrolytic bath, removing particles in said tin chloride solution and remaining components of said smoothing agent carried from the step, and then recycling to said electrolytic bath again said tin chloride solution from which said particles and said remaining components of said smoothing agent have been removed; and a step comprising melting and casting said needle-like secondary refined electrodeposited tin in a reducing gas atmosphere wherein the smoothing agent is a nonionic surfactant composed of a compound having a structure in which one or more hydroxyl groups are bonded to an aryl group(s) directly or via one or more methylene groups and/or one or more ethylene oxide groups.