A direct AC power converting apparatus, comprising: first to N-th input lines (ACLr, ACLs, ACLt) connected to an N-phase AC power supply; a positive-side DC power supply line and a negative-side DC power supply line; a current-source power converter including a plurality of switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn), converting an AC voltage input from said first to N-th input lines (ACLr, ACLs, ACLt) into a square-wave-shape voltage having two potentials by selection operations of said plurality of switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn) to supply said voltage to said positive-side DC power supply line and said negative-side DC power supply line; a plurality of input capacitors (Cr, Cs, Ct) each provided between ones of said first to N-th input lines (ACLr, ACLs, ACLt) and functioning as a voltage source; a first diode connected between said positive-side DC power supply line and said negative-side DC power supply line; a voltage-source power converter converting said DC voltage having two potentials between said positive-side DC power supply line and said negative-side DC power supply line into a square-wave-shape AC voltage and outputting to an inductive multi-phase load; a control section; and a capacitor (Cc; Cc1, Cc2) connected, between said positive-side DC power supply line and said negative-side DC power supply line, in series with said first diode; characterized by a power supply switch selecting conduction/nonconduction of said first to N-th input lines (ACLr, ACLs, ACLt); a first resistor provided on said first input line (ACLr); and characterized in that the control section configured to control the selection operations of said plurality of switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn) and said power supply switch, and configured to control the selection operations of said switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn) simultaneously with or prior to conduction of said power supply switch to connect said capacitor (Cc; Cc1, Cc2 and said input capacitor (Cr, Ct) provided between said first input line and said second input line in parallel with each other. first to N-th input lines (ACLr, ACLs, ACLt) connected to an N-phase AC power supply; a positive-side DC power supply line and a negative-side DC power supply line; a current-source power converter including a plurality of switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn), converting an AC voltage input from said first to N-th input lines (ACLr, ACLs, ACLt) into a square-wave-shape voltage having two potentials by selection operations of said plurality of switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn) to supply said voltage to said positive-side DC power supply line and said negative-side DC power supply line; a plurality of input capacitors (Cr, Cs, Ct) each provided between ones of said first to N-th input lines (ACLr, ACLs, ACLt) and functioning as a voltage source; a first diode connected between said positive-side DC power supply line and said negative-side DC power supply line; a voltage-source power converter converting said DC voltage having two potentials between said positive-side DC power supply line and said negative-side DC power supply line into a square-wave-shape AC voltage and outputting to an inductive multi-phase load; a control section; and a capacitor (Cc; Cc1, Cc2) connected, between said positive-side DC power supply line and said negative-side DC power supply line, in series with said first diode; a power supply switch selecting conduction/nonconduction of said first to N-th input lines (ACLr, ACLs, ACLt); a first resistor provided on said first input line (ACLr); and characterized in that the control section configured to control the selection operations of said plurality of switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn) and said power supply switch, and configured to control the selection operations of said switch devices (Srp, Srn, Ssp, Ssn, Stp, Stn) simultaneously with or prior to conduction of said power supply switch to connect said capacitor (Cc; Cc1, Cc2 and said input capacitor (Cr, Ct) provided between said first input line and said second input line in parallel with each other.