A tube pump comprising: a housing including a cylindrical side wall in an inner portion thereof; a rotor including a roller arranged on an inward side of the cylindrical side wall of the housing, the rotor being rotated by a drive source; a duct including a curved portion for attachment between the cylindrical side wall and the roller, the tube pump being configured to rotate the rotor to squeeze the curved portion via the roller thereby pumping a fluid via the duct, wherein the duct is provided with a supply tube connected to an end of the curved portion via a supply-side connector and a discharge tube connected to the other end of the curved portion via a discharge-side connector; and a single holder for engagement with each of said connectors (17, 17'), characterised in that: the holder has a recess portion (7D, 7D') for engagement with each of said connectors (17, 17'), the holder having a pair of right and left flat portions (7F, 7F') formed on an outer side of the recess portion (7D, 7D'), each flat portion extending to a respective edge portion having a linear engagement portion; the housing has a notch portion having a pair of opposing side walls extending from the cylindrical side walls, each sidewall having a respective engagement groove extending in a direction intersecting the axis of the drive shaft, each engagement groove for receiving a respective linear engagement portion for releaseably securing the holder to the housing when the connectors (17,17') are held in the recess portion (7D, 7D') of the holder. a housing including a cylindrical side wall in an inner portion thereof; a rotor including a roller arranged on an inward side of the cylindrical side wall of the housing, the rotor being rotated by a drive source; a duct including a curved portion for attachment between the cylindrical side wall and the roller, the tube pump being configured to rotate the rotor to squeeze the curved portion via the roller thereby pumping a fluid via the duct, wherein the duct is provided with a supply tube connected to an end of the curved portion via a supply-side connector and a discharge tube connected to the other end of the curved portion via a discharge-side connector; and a single holder for engagement with each of said connectors (17, 17'), characterised in that: the holder has a recess portion (7D, 7D') for engagement with each of said connectors (17, 17'), the holder having a pair of right and left flat portions (7F, 7F') formed on an outer side of the recess portion (7D, 7D'), each flat portion extending to a respective edge portion having a linear engagement portion; the housing has a notch portion having a pair of opposing side walls extending from the cylindrical side walls, each sidewall having a respective engagement groove extending in a direction intersecting the axis of the drive shaft, each engagement groove for receiving a respective linear engagement portion for releaseably securing the holder to the housing when the connectors (17,17') are held in the recess portion (7D, 7D') of the holder. the holder has a recess portion (7D, 7D') for engagement with each of said connectors (17, 17'), the holder having a pair of right and left flat portions (7F, 7F') formed on an outer side of the recess portion (7D, 7D'), each flat portion extending to a respective edge portion having a linear engagement portion; the housing has a notch portion having a pair of opposing side walls extending from the cylindrical side walls, each sidewall having a respective engagement groove extending in a direction intersecting the axis of the drive shaft, each engagement groove for receiving a respective linear engagement portion for releaseably securing the holder to the housing when the connectors (17,17') are held in the recess portion (7D, 7D') of the holder.