A blow molding machine, comprising: an molding section for molding a plurality of preforms (P); and a blow molding section for stretch blow molding a predetermined number of the preforms (P), at a time, into containers, the blow molding machine further comprising a transport section including a continuous transport section for continuously transporting the predetermined number of preforms (P) along a transport path, and an intermittent transport section for intermittently transporting the predetermined number of preforms (P) along the transport path, a transfer section being adapted for gripping the predetermined number of preforms (P) being transported on the transport path by the intermittent transport section, and transferring the predetermined number of preforms (P) to the blow molding section , a discharge section, provided downstream of the transfer section on the transport path, being adapted for discharging the preforms (P) from the transport path, and change means being adapted for making a change in at least one of an injection molding cycle time and a blow molding cycle time, and making a change in a transport speed of the preform (P) by the transport section in accordance with the change, wherein if some of the plurality of preforms (P) go beyond the transfer section at a timing, at which the transfer section transfers the preform (P) to the blow molding section , in association with the changes by the change means the transport section being adapted for transporting the predetermined number of preforms (P) to the discharge section comprising a preform carry-out device located at an intermittent transport position (P2), the machine being characterized in that the molding section for molding a plurality of preforms (P) is an injection molding section for injection molding a plurality of preforms (P) and wherein upstream the transfer section it is provided a transfer timing detection section being adapted for detecting whether or not the preform (P) is transported beyond the transfer section at a predetermined timing as described above. an molding section for molding a plurality of preforms (P); and a blow molding section for stretch blow molding a predetermined number of the preforms (P), at a time, into containers, the blow molding machine further comprising a transport section including a continuous transport section for continuously transporting the predetermined number of preforms (P) along a transport path, and an intermittent transport section for intermittently transporting the predetermined number of preforms (P) along the transport path, a transfer section being adapted for gripping the predetermined number of preforms (P) being transported on the transport path by the intermittent transport section, and transferring the predetermined number of preforms (P) to the blow molding section , a discharge section, provided downstream of the transfer section on the transport path, being adapted for discharging the preforms (P) from the transport path, and change means being adapted for making a change in at least one of an injection molding cycle time and a blow molding cycle time, and making a change in a transport speed of the preform (P) by the transport section in accordance with the change, <EOS>