A sheet conveying apparatus includes a first conveying path, a second conveying path and a third conveying path, a switching guide, a conveying roller, a driving mechanism, a transmission mechanism. The second conveying path and the third conveying path are formed by diverging from the first conveying path. The switching guide switches the conveying path between the second conveying path and the third conveying path. The switching guide enables to change between a first position in which the sheet is conveyed into the second conveying path and a second position in which the sheet is conveyed into the third conveying path. The conveying roller is arranged on the third conveying path to convey the sheet. The driving mechanism generates a rotational driving force that rotates the conveying roller. The transmission mechanism transmits the rotational driving force to the conveying roller in accordance with the position of the switching guide.