a sheet conveying device provided with a detent mechanism and capable of effecting automatic feeding of the shet by the use of a drive source and also capable of effecting feeding of the sheet by manual operation , the sheet conveying device including a rotational member for conveying a sheet , a drive source for driving the rotational member , a drive transmitting device for transmitting the drive force of the drive source to the rotational member to rotate the rotational member by the drive force of the drive source , a manual operating member for manually driving the rotational member , a detent device producing a rotation restraining force , a restraining force transmitting device for transmitting the restraining force from the detent device , and apparatus for connecting and disconnecting the restraining force transmitting device and the drive transmitting device .