The present invention relates to a portable toothbrush for enabling a user to use the toothbrush which is provided with a toothbrush member developed on a support plate and having a little thickness, to be easily carried and provided as a promotional article or the like, and comprises a toothbrush head and a toothbrush bar by a structure formed by bending and assembling the developed toothbrush member when the user uses the toothbrush. The portable toothbrush according to the present invention has the structure in which the toothbrush member is developed on the support plate, and comprises: a toothbrush head assembling part having opposite toothbrush head portions dividedly formed at regular intervals on both sides of a longitudinal upper end surface of the support plate, and having a first coupling hole formed in one side of the toothbrush head portion； and a toothbrush bar assembling part including opposite support protrusions formed on both side ends of a lower end portion at both side ends of a surface of the support plate being in contact with the toothbrush head portion, and having a second coupling hole formed in one side of the support protrusion.본 발명은 지지판에 전개되고 두께가 얇은 칫솔부재로 구비되어 휴대가 간편하고 판촉물 등으로 제공이 용이하며, 칫솔 사용시에는 전개된 칫솔부재를 절곡하여 조립하는 구성에 의해 칫솔헤드와 칫솔대로 이루어진 칫솔을 사용할 수 있도록 한 휴대용 칫솔에 관한 것이다.즉, 본 발명은 칫솔부재가 지지판에 전개된 구성으로 이루어지되 지지판의 길이방향 상단부 표면 양측에 일정간격으로 마주보는 칫솔헤드부가 분할 형성되고, 칫솔헤드부의 일측에 제1결합구가 형성되어 있는 칫솔헤드 조립부와； 상기 칫솔헤드부와 접하는 지지판의 표면 양측단에서 하단부의 양측단에 마주보는 지지돌부가 형성되고, 지지돌부의 일측에 제2결합구가 형성되어 있는 칫솔대 조립부；가 구비되어 있는 휴대용 칫솔을 특징으로 한다.
