Patent ID: 8180234

Claim:
An image forming apparatus comprising: an informing portion that issues information; a storing portion that stores sheets; a sheet detecting portion that detects presence or absence of the sheets in the storing portion; a determination portion that determines a type of the sheets stored in the storing portion; an opening/closing detecting portion that detects opening and closing of the storing portion with respect to the image forming apparatus; a sheet amount detecting portion that detects an amount of the sheets stored in the storing portion; and a control portion that causes the informing portion to issue a predetermined information in a case where the absence of the sheets is undetected by the sheet detecting portion and a change of the type of the sheets is determined by the determination portion; wherein the control portion causes the informing portion to issue the predetermined information in a case where an amount of the sheets detected by the sheet amount detecting portion after the opening and closing of the storing portion are detected by the opening/closing detecting portion is larger than an amount of the sheets detected by the sheet amount detecting portion before the opening of the storing portion is detected by the opening/closing detecting portion, and the absence of the sheets is not detected by the sheet detecting portion until the closing of the storing portion is detected after the opening of the storing portion is detected.