An image forming apparatus, comprising: a plurality of toner supplying devices (60Y, 60M, 60C, 60K); a plurality of toner containers (32Y, 32M, 32C, 32K); and a plurality of developing devices (5Y, 5M, 5C, 5K); wherein the plural toner supplying devices (60Y, 60M, 60C, 60K) supply toners stored in the corresponding toner containers (32Y, 32M, 32C, 32K) to the corresponding developing devices (5Y, 5M, 5C, 5K); and the toner supplying devices (60Y, 60M, 60C, 60K) include corresponding toner tanks (61Y, 61M, 61C, 61K) which store the corresponding toners discharged from the corresponding toner containers (32Y, 32M, 32C, 32K); corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) which carry the corresponding toners stored in the corresponding toner tanks (61Y, 61M, 61C, 61K); corresponding toner dropping routes (64Y, 64M, 64C, 64K) which cause the toners carried by the corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) to drop into the corresponding developing devices (5Y, 5M, 5C, 5K) by toner own weight; and corresponding control units which control an amount of the corresponding toners to flow into the corresponding toner dropping routes (64Y, 64M, 64C, 64K); the toner carrying sections (62Y, 63Y, 62M,63M, 62C, 63C, 62K, 63K) carry the corresponding toners in an obliquely upward direction; the control units are the toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K); the toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) linearly carry the corresponding toners stored in the corresponding toner tanks (61Y, 61M, 61C, 61K) from a bottom section of the toner tanks (61Y, 61M, 61C, 61K) to a position above the corresponding developing devices (5Y, 5M, 5C, 5K); the toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) include corresponding toner carrying screws (62Y, 62M, 62C, 62K) which carry the corresponding toners by being rotated in a predetermined direction; and corresponding toner carrying tubes (63Y, 63M, 63C, 63K) having an internal wall in which the corresponding toner carrying screws (62Y, 62M, 62C, 62K) are disposed; characterized in that the control units include corresponding magnetic field generating units (68Y, 68M, 68C, 68K) for generating a magnetic field in the corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K); and corresponding magnetic substances which are sustained in the corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 62K, 63K) by the magnetic field generated by the corresponding magnetic field generating units (68Y, 68M, 68C, 68K); wherein the upper half parts of the corresponding magnetic field generating units (68Y, 68M, 68C, 68K) are obliquely wound around the corresponding toner carrying tubes (63Y, 63M, 63C, 63K). a plurality of toner supplying devices (60Y, 60M, 60C, 60K); a plurality of toner containers (32Y, 32M, 32C, 32K); and a plurality of developing devices (5Y, 5M, 5C, 5K); wherein the plural toner supplying devices (60Y, 60M, 60C, 60K) supply toners stored in the corresponding toner containers (32Y, 32M, 32C, 32K) to the corresponding developing devices (5Y, 5M, 5C, 5K); and the toner supplying devices (60Y, 60M, 60C, 60K) include corresponding toner tanks (61Y, 61M, 61C, 61K) which store the corresponding toners discharged from the corresponding toner containers (32Y, 32M, 32C, 32K); corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) which carry the corresponding toners stored in the corresponding toner tanks (61Y, 61M, 61C, 61K); corresponding toner dropping routes (64Y, 64M, 64C, 64K) which cause the toners carried by the corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) to drop into the corresponding developing devices (5Y, 5M, 5C, 5K) by toner own weight; and corresponding control units which control an amount of the corresponding toners to flow into the corresponding toner dropping routes (64Y, 64M, 64C, 64K); the toner carrying sections (62Y, 63Y, 62M,63M, 62C, 63C, 62K, 63K) carry the corresponding toners in an obliquely upward direction; the control units are the toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K); the toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) linearly carry the corresponding toners stored in the corresponding toner tanks (61Y, 61M, 61C, 61K) from a bottom section of the toner tanks (61Y, 61M, 61C, 61K) to a position above the corresponding developing devices (5Y, 5M, 5C, 5K); the toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K) include corresponding toner carrying screws (62Y, 62M, 62C, 62K) which carry the corresponding toners by being rotated in a predetermined direction; and corresponding toner carrying tubes (63Y, 63M, 63C, 63K) having an internal wall in which the corresponding toner carrying screws (62Y, 62M, 62C, 62K) are disposed; characterized in that the control units include corresponding magnetic field generating units (68Y, 68M, 68C, 68K) for generating a magnetic field in the corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 63C, 62K, 63K); and corresponding magnetic substances which are sustained in the corresponding toner carrying sections (62Y, 63Y, 62M, 63M, 62C, 62K, 63K) by the magnetic field generated by the corresponding magnetic field generating units (68Y, 68M, 68C, 68K); wherein the upper half parts of the corresponding magnetic field generating units (68Y, 68M, 68C, 68K) are obliquely wound around the corresponding toner carrying tubes (63Y, 63M, 63C, 63K).