An alarm system (1, 2, 3) in which a plurality of alarms including a first apparatus (10, 30, 50) which is a master device and a second apparatus (20, 40, 60) which is a slave device cooperate with each other to achieve alarming in an interconnected manner between the plurality of alarms, the first apparatus (10, 30, 50) including: a first controller (106, 306, 509) configured to execute a setting process of making a setting for interconnected operation between the first apparatus (10, 30, 50) and the second apparatus (20, 40, 60); and a first storage (109, 307, 510) configured to store a master device identification code identifying the first apparatus (10, 30, 50), the second apparatus (20, 40, 60) including: a second controller (206, 406, 606) configured to execute the setting process between the second apparatus (20, 40, 60) and the first apparatus (10, 30, 50); and a second storage (209, 409, 609) configured to store a plurality of master device identification codes representing types of various alarms expected to be applied to the first apparatus and to store individual setting information associated to each of the master device identification codes, wherein the individual setting information is information regarding a setting of the second apparatus (20, 40, 60), the first controller (106, 306, 509) being configured to transmit the master device identification code to the second apparatus (20, 40, 60) in the setting process, the second controller (206, 406, 606) being configured to: when the second controller receives the master device identification code, select the individual setting information corresponding to the master device identification code which the second controller is to set; and to, based on the individual setting information thus selected, make a setting of the second apparatus (20, 40, 60) in the setting process. the first apparatus (10, 30, 50) including: a first controller (106, 306, 509) configured to execute a setting process of making a setting for interconnected operation between the first apparatus (10, 30, 50) and the second apparatus (20, 40, 60); and a first storage (109, 307, 510) configured to store a master device identification code identifying the first apparatus (10, 30, 50), the second apparatus (20, 40, 60) including: a second controller (206, 406, 606) configured to execute the setting process between the second apparatus (20, 40, 60) and the first apparatus (10, 30, 50); and a second storage (209, 409, 609) configured to store a plurality of master device identification codes representing types of various alarms expected to be applied to the first apparatus and to store individual setting information associated to each of the master device identification codes, wherein the individual setting information is information regarding a setting of the second apparatus (20, 40, 60), the first controller (106, 306, 509) being configured to transmit the master device identification code to the second apparatus (20, 40, 60) in the setting process, the second controller (206, 406, 606) being configured to: when the second controller receives the master device identification code, select the individual setting information corresponding to the master device identification code which the second controller is to set; and to, based on the individual setting information thus selected, make a setting of the second apparatus (20, 40, 60) in the setting process.