A circuit breaker comprising: a cradle having a plurality of cradle terminals; and a breaker main body connected to the cradle and having a plurality of breaker terminals electrically connected to the plurality of cradle terminals, each of the plurality of breaker terminals comprises: a terminal body extended from the breaker main body and protruded toward each of the plurality of cradle terminals; contacts coupled to upper and lower portions of terminal body and disposed in parallel to face each other; and a contact protrusion protruded to a round shape in a direction in which the contacts face each other such that, upon connection of the plurality of cradle terminals, the contact protrusion contacts and presses both sides of the connected cradle terminals, characterized in that the contacts are divided into six pieces, of which three pieces are coupled to one surface of the terminal body, and remaining three pieces are coupled to the other surface of the terminal body, wherein the contacts are fixed to the terminal body by a pin fixing member and a contact spring, wherein the contact spring is provided between the contacts coupled to the one surface of the terminal body and a head of the pin fixing member to impart a predetermined elastic force to the contacts, wherein the contacts are disposed in parallel to face each other with a wider spacing than the thickness of each of the plurality of cradle terminals, and the contact protrusion are protruded with a gap narrower than the thickness of each of the plurality of cradle terminals, wherein the contact protrusion comprises a plurality of contact protrusions for each of the contacts, wherein the plurality of contact protrusions are disposed close to front end portions of the contacts and provided in a straight line along a longitudinal direction of the contacts, wherein the cradle and breaker main body are connectable in a transversal arrangement or a longitudinal arrangement. a cradle having a plurality of cradle terminals; and a breaker main body connected to the cradle and having a plurality of breaker terminals electrically connected to the plurality of cradle terminals, each of the plurality of breaker terminals comprises: a terminal body extended from the breaker main body and protruded toward each of the plurality of cradle terminals; contacts coupled to upper and lower portions of terminal body and disposed in parallel to face each other; and a contact protrusion protruded to a round shape in a direction in which the contacts face each other such that, upon connection of the plurality of cradle terminals, the contact protrusion contacts and presses both sides of the connected cradle terminals, a terminal body extended from the breaker main body and protruded toward each of the plurality of cradle terminals; contacts coupled to upper and lower portions of terminal body and disposed in parallel to face each other; and a contact protrusion protruded to a round shape in a direction in which the contacts face each other such that, upon connection of the plurality of cradle terminals, the contact protrusion contacts and presses both sides of the connected cradle terminals, characterized in that the contacts are divided into six pieces, of which three pieces are coupled to one surface of the terminal body, and remaining three pieces are coupled to the other surface of the terminal body, wherein the contacts are fixed to the terminal body by a pin fixing member and a contact spring, wherein the contact spring is provided between the contacts coupled to the one surface of the terminal body and a head of the pin fixing member to impart a predetermined elastic force to the contacts, wherein the contacts are disposed in parallel to face each other with a wider spacing than the thickness of each of the plurality of cradle terminals, and the contact protrusion are protruded with a gap narrower than the thickness of each of the plurality of cradle terminals, wherein the contact protrusion comprises a plurality of contact protrusions for each of the contacts, wherein the plurality of contact protrusions are disposed close to front end portions of the contacts and provided in a straight line along a longitudinal direction of the contacts, wherein the cradle and breaker main body are connectable in a transversal arrangement or a longitudinal arrangement.