Image forming apparatus

An image forming apparatus comprising:

• an image bearing member that moves a toner image while bearing the toner image;
• a transfer portion in which the toner image is transferred from the image bearing member to a recording material;
• a conveying member that conveys the recording material to the transfer portion while moving integral with the recording material;
• a conveying member position index sensing member that senses a conveying member position index at a position close to the transfer portion, the conveying member position index being fixed to the conveying member as a periodic pattern along a moving direction of the conveying member;
• a toner image position index sensing member that senses a toner image position index at a position close to the transfer portion, the toner image position index being fixed to the image bearing member as a periodic pattern along a moving direction of the image bearing member according to the toner image;
• a drive member that can control at least one of a position of the conveying member in the moving direction of the conveying member and a rotating speed of the conveying member;
• and
• a control portion that controls the drive member to position the conveying member position index with respect to the toner image position index reaching the transfer portion based on the sensing results of the conveying member position index and the toner image position index.