A method for producing a film comprising a thermoplastic resin composition, the method comprising: a step of subjecting a thermoplastic resin composition to preliminary heating at 100 to 250°C; a step of subjecting a first roller and second roller of a calender-roll film-forming apparatus to pre-heating, wherein the pre-heating temperature of the first roller and second roller ranges from 100 °C to 200 °C; and a step of introducing the thermoplastic resin composition, which has been subjected to preliminary heating in step, into a clearance between the first roller and second roller, which have been pre-heated in step, and continuously winding a melted film of the thermoplastic resin composition on the first roller, wherein a rotation rate of the first roller is faster than a rotation rate of the second roller, wherein the thermoplastic resin composition comprises: 100 parts by mass of a thermoplastic resin; 1 to 60 parts by mass of carbon nanotubes; and 1 to 100 parts by mass of at least one selected from the group consisting of acetylene black and graphite, and wherein either the following condition (α) or (β) is fulfilled: (α) the thermoplastic resin is a resin mixture comprising: 30 to 80% by mass of a chlorinated polyethylene having a chlorine content of 20 to 45% by mass; and 70 to 20% by mass of a polyethylene other than, wherein the sum of and is 100% by mass; or (β) the thermoplastic resin is a polyethylene satisfying the following properties (p) and (q): (p) the highest melting point among peak top melting points in a DSC melting curve is 120°C or higher; and (q) a fraction of melting enthalpy in a temperature range of 110°C or lower relative to the total melting enthalpy in a DSC melting curve is 50 to 80%. a step of subjecting a thermoplastic resin composition to preliminary heating at 100 to 250°C; a step of subjecting a first roller and second roller of a calender-roll film-forming apparatus to pre-heating, wherein the pre-heating temperature of the first roller and second roller ranges from 100 °C to 200 °C; and a step of introducing the thermoplastic resin composition, which has been subjected to preliminary heating in step, into a clearance between the first roller and second roller, which have been pre-heated in step, and continuously winding a melted film of the thermoplastic resin composition on the first roller, wherein a rotation rate of the first roller is faster than a rotation rate of the second roller, wherein the thermoplastic resin composition comprises: 100 parts by mass of a thermoplastic resin; 1 to 60 parts by mass of carbon nanotubes; and 1 to 100 parts by mass of at least one selected from the group consisting of acetylene black and graphite, and 100 parts by mass of a thermoplastic resin; 1 to 60 parts by mass of carbon nanotubes; and 1 to 100 parts by mass of at least one selected from the group consisting of acetylene black and graphite, and wherein either the following condition (α) or (β) is fulfilled: (α) the thermoplastic resin is a resin mixture comprising: 30 to 80% by mass of a chlorinated polyethylene having a chlorine content of 20 to 45% by mass; and 70 to 20% by mass of a polyethylene other than, wherein the sum of and is 100% by mass; or (β) the thermoplastic resin is a polyethylene satisfying the following properties (p) and (q): (p) the highest melting point among peak top melting points in a DSC melting curve is 120°C or higher; and (q) a fraction of melting enthalpy in a temperature range of 110°C or lower relative to the total melting enthalpy in a DSC melting curve is 50 to 80%. (α) the thermoplastic resin is a resin mixture comprising: 30 to 80% by mass of a chlorinated polyethylene having a chlorine content of 20 to 45% by mass; and 70 to 20% by mass of a polyethylene other than, wherein the sum of and is 100% by mass; or (β) the thermoplastic resin is a polyethylene satisfying the following properties (p) and (q): (p) the highest melting point among peak top melting points in a DSC melting curve is 120°C or higher; and (q) a fraction of melting enthalpy in a temperature range of 110°C or lower relative to the total melting enthalpy in a DSC melting curve is 50 to 80%. (p) the highest melting point among peak top melting points in a DSC melting curve is 120°C or higher; and (q) a fraction of melting enthalpy in a temperature range of 110°C or lower relative to the total melting enthalpy in a DSC melting curve is 50 to 80%.