There is provided an observation attachment and a display apparatus achieving reduction in a burden of visual line movement of a user. The observation attachment is mounted on a surgical microscope having an eyepiece. The observation attachment includes a mounting member attached to the surgical microscope and a display holding member which holds a display provided with a display screen displayed with information for assisting a work of a user in using the surgical microscope, the information being different from an object's image directly observed through the eyepiece, and places the display screen of the display around the eyepiece of the surgical microscope in an attached state that the mounting member is attached to the surgical microscope.
