PURPOSE: To adjust temp. of a hot runner block and a plurality of nozzle main bodies fixed thereon with good balance.

CONSTITUTION: A plurality of built-in heaters 48 and heat pipes 50 are set in a hot runner block 40 along the longer direction to accomplish keeping of uniform temp. with less temp. gradient in the longitudinal direction of the block 40 wherein runners 44 and 46 are provided. In the fixed end sides of a plurality of nozzle bodies each one of which is fixed on the block 40, heat pipes 66 over the intermediate position of the nozzle bodies from the fixed end part are provided. The fixed end side of each nozzle body 60 is temp.-controlled by utilizing the heat of a block 30. On the nozzle opening 72a side of each nozzle main body 60, a band heater 68 being independently temp.-controllable is wound. Heat supply which can keep a balance of heat exchange with an injection cavity mold 20 which is to be a cooling source is independently performed by this independent band heater 68 and resin filling with less deviation is performed from each nozzle opening 72.