Charger and image forming apparatus

A charger includes a charging roller and a support portion which rotationally supports the charging roller. The charging roller includes a first region which is opposed to the support portion and a second region which is not opposed to the support portion. The charging roller includes a conductive shaft, an end part cover portion which is in contact with and covers the conductive shaft in a portion corresponding to the first region and is in slide contact with the support portion, and a high-resistance coating which is in contact with and covers the conductive shaft in a portion corresponding to the second region and abuts on a charged object. An inner end portion of the end part cover portion is covered with the high-resistance coating, and a thickness of the high-resistance coating is equal to or greater than a thickness of the end part cover portion.