A drawer type breaker comprising: a drawer frame ; a terminal device including a plurality of drawer-frame side conductors connectable to a supply-side conductor and a load-side conductor, the terminal device being configured to be secured in the drawer frame ; a circuit breaker body including a plurality of breaker-side conductors configured to be connected to the plurality of drawer-frame side conductors in a state in which the conductors are received in the drawer frame , the breaker body being configured to be drawable out of the drawer frame ; and a shutter mechanism including a panel unit having a plurality of openings configured to be penetrated by the plurality of breaker-side conductors when the breaker body is received in the drawer frame , the panel unit being disposed between the terminal device and the breaker body , and a shutter unit configured to shut the plurality of openings when the breaker body is drawn out of the drawer frame , wherein the terminal device includes an insulation base having a plurality of terminal receiving portions configured to receive the plurality of drawer-frame side conductors , and having an airway portion including one or more airways connected to at least one of the terminal receiving portions , wherein the airway portion includes an airway between the terminal receiving portions , wherein the drawer type breaker comprises a slider placed in the insulation base , which is configured to move the shutter unit in a direction for drawing out the breaker body in accordance with drawing out the breaker body from the drawer frame , wherein the insulation base includes a slider housing portion formed between the terminal receiving portions , which is configured to house the slider movably in a direction in which the slider is opposed to the breaker body , characterized in that the slider includes one or more openings forming an airway between the terminal receiving portions . a drawer frame ; a terminal device including a plurality of drawer-frame side conductors connectable to a supply-side conductor and a load-side conductor, the terminal device being configured to be secured in the drawer frame ; a circuit breaker body including a plurality of breaker-side conductors configured to be connected to the plurality of drawer-frame side conductors in a state in which the conductors are received in the drawer frame , the breaker body being configured to be drawable out of the drawer frame ; and a shutter mechanism including a panel unit having a plurality of openings configured to be penetrated by the plurality of breaker-side conductors when the breaker body is received in the drawer frame , the panel unit being disposed between the terminal device and the breaker body , and a shutter unit configured to shut the plurality of openings when the breaker body is drawn out of the drawer frame , wherein the terminal device includes an insulation base having a plurality of terminal receiving portions configured to receive the plurality of drawer-frame side conductors , and having an airway portion including one or more airways connected to at least one of the terminal receiving portions , wherein the airway portion includes an airway between the terminal receiving portions , wherein the drawer type breaker comprises a slider placed in the insulation base , which is configured to move the shutter unit in a direction for drawing out the breaker body in accordance with drawing out the breaker body from the drawer frame , wherein the insulation base includes a slider housing portion formed between the terminal receiving portions , which is configured to house the slider movably in a direction in which the slider is opposed to the breaker body , characterized in that the slider includes one or more openings forming an airway between the terminal receiving portions . <EOS>