A portable toothbrush of the present invention comprises: a toothbrush part in which brush heads are provided on one side and a coupling hole is formed on the other side; a storage unit which is connected with the toothbrush part by, after forming an inner space, forming a coupling jaw in which a discharging hole communicated with the space is formed on one side and an opening hole on the other side; and then by coupling the coupling jaw to the coupling hole; and a closure which is coupled with the opening hole and forms a joint hole on the lower part.
