Attachment

An attachment which is attachable to a game controller including a controller-side slide portion that includes a controller-side first operation button, the attachment comprising:

• a strap;
• an attachment-side slide portion on a first surface of the attachment, the attachment-side slide portion having a first side of a center of the attachment-side slide portion and a second side of the center of the attachment-slide portion opposite to each other in a predetermined slide direction, wherein the attachment-side slide portion is configured to slidably engage with the controller-side slide portion in the slide direction, and wherein the controller-side slide portion is insertable into the attachment-side slide portion from the first side;
• a lock portion on the first side of the center of the attachment-side slide portion and configured to generally prevent a slide movement, in a removal direction opposite to an insertion direction, of the controller-side slide portion in a state in which the controller-side slide portion has been inserted into the attachment-side slide portion, thereby attaching the game controller to the attachment;
• and
• an attachment-side first operation button on a second surface which is on a reverse side of the first surface,
• wherein the attachment-side first operation button includes a first actuation portion configured to move from a first position to a second position, thereby pressing the controller-side first operation button, in response to an operation of pressing the attachment-side first operation button.