An indoor unit of an air conditioner, comprising: an electric control box; and a cleaning assembly comprising: a filter screen rail module; and a cleaning module configured to drive a filter screen to move on the filter screen rail module to clean the filter screen, and comprising an electrical wire connecting end; and an electrical wire, wherein one end of the electrical wire is connected to the electrical wire connecting end, and the other end of the electrical wire is connected to the electric control box, characterized in that the electrical wire is arranged on the cleaning module and the filter screen rail module, wherein the electrical wire comprises: a first electrical wire section arranged at the cleaning module; and a second electrical wire section arranged at the filter screen rail module; wherein the second electrical wire section is arranged at a front side of the filter screen rail module; wherein the indoor unit is configured so that when it is hanged on a wall, the front side of the filter screen rail module is away from the wall, wherein the indoor unit further comprises a clamping line member disposed at the front side of the filter screen rail module, wherein the second electrical wire section is penetrated through the clamping line member, wherein the clamping line member defines: an electrical wire penetrating groove arranged along a length direction of the filter screen rail module; and an opening communicating with the electrical wire penetrating groove; wherein the indoor unit is configured so that at least a part of the second electrical wire section can be inserted into the electrical wire penetrating groove through the opening. an electric control box; and a cleaning assembly comprising: a filter screen rail module; and a cleaning module configured to drive a filter screen to move on the filter screen rail module to clean the filter screen, and comprising an electrical wire connecting end; and a filter screen rail module; and a cleaning module configured to drive a filter screen to move on the filter screen rail module to clean the filter screen, and comprising an electrical wire connecting end; and an electrical wire, wherein one end of the electrical wire is connected to the electrical wire connecting end, and the other end of the electrical wire is connected to the electric control box, characterized in that the electrical wire is arranged on the cleaning module and the filter screen rail module, wherein the electrical wire comprises: a first electrical wire section arranged at the cleaning module; and a second electrical wire section arranged at the filter screen rail module; a first electrical wire section arranged at the cleaning module; and a second electrical wire section arranged at the filter screen rail module; wherein the second electrical wire section is arranged at a front side of the filter screen rail module; wherein the indoor unit is configured so that when it is hanged on a wall, the front side of the filter screen rail module is away from the wall, wherein the indoor unit further comprises a clamping line member disposed at the front side of the filter screen rail module, wherein the second electrical wire section is penetrated through the clamping line member, wherein the clamping line member defines: an electrical wire penetrating groove arranged along a length direction of the filter screen rail module; and an opening communicating with the electrical wire penetrating groove; wherein the indoor unit is configured so that at least a part of the second electrical wire section can be inserted into the electrical wire penetrating groove through the opening.