According to the present invention, provided is a portable toothbrush cap which is a portable toothbrush cap protecting a portable toothbrush head (20), and which is characterized by including a body (200) including an internal space (210) where the head (20) is inserted; and an attachment part (100) attaching the body (200) to the wall (10), wherein the attachment part (100) includes an attachment wing (120) formed along around the body (200); and a storage space (110) formed on the back of the internal space (210) and storing a fixing band (310) fixing the attachment wing (120) while the attachment wing (120) is folded.
