A sputtered particle measuring device (1, 100, 200, 300) comprising: a sputtering source comprising a target; a power supply arranged to supply pulsed electric power to the sputtering source so as to generate a pulsed electric discharge; a measuring section arranged to measure a ratio between an equivalent value of the number of ion particles discharged from the target by sputtering caused by a pulsed electric discharge and an equivalent value of the number of neutral particles discharged from the target by the sputtering caused by the pulsed electric discharge; an ionizing section arranged to ionize the neutral particles discharged from the target by the sputtering; a frequency divider arranged to generate a frequency dividing signal based on a pulse signal synchronized with an occurrence of the pulsed electric discharge, the frequency dividing signal having a period that is an integral multiple of a period of the pulse signal; a driver arranged to drive the ionizing section with the frequency dividing signal; and a controller arranged to cause the frequency dividing signal to be generated at a first timing; wherein the pulsed electric discharge is constituted by a plurality of successive pulsed electric discharges, and wherein the measuring section is arranged to measure the ratio based on the equivalent value or the equivalent values of either or both of the ion particles and the neutral particles discharged from the target by the sputtering caused by the pulsed electric discharge occurring at the first timing and based on the equivalent value or the equivalent values of either or both of the ion particles and the neutral particles discharged from the target by the sputtering caused by the pulsed electric discharge occurring at a timing different from the first timing. a sputtering source comprising a target; a power supply arranged to supply pulsed electric power to the sputtering source so as to generate a pulsed electric discharge; a measuring section arranged to measure a ratio between an equivalent value of the number of ion particles discharged from the target by sputtering caused by a pulsed electric discharge and an equivalent value of the number of neutral particles discharged from the target by the sputtering caused by the pulsed electric discharge; an ionizing section arranged to ionize the neutral particles discharged from the target by the sputtering; a frequency divider arranged to generate a frequency dividing signal based on a pulse signal synchronized with an occurrence of the pulsed electric discharge, the frequency dividing signal having a period that is an integral multiple of a period of the pulse signal; a driver arranged to drive the ionizing section with the frequency dividing signal; and a controller arranged to cause the frequency dividing signal to be generated at a first timing; wherein the pulsed electric discharge is constituted by a plurality of successive pulsed electric discharges, and wherein the measuring section is arranged to measure the ratio based on the equivalent value or the equivalent values of either or both of the ion particles and the neutral particles discharged from the target by the sputtering caused by the pulsed electric discharge occurring at the first timing and based on the equivalent value or the equivalent values of either or both of the ion particles and the neutral particles discharged from the target by the sputtering caused by the pulsed electric discharge occurring at a timing different from the first timing.