Solenoid, solenoid valve, and shock absorber

A solenoid comprising:

• a coil;
• a first fixed iron core located on a first end side of an axial direction of the coil;
• a second fixed iron core located on a second end side of the axial direction of the coil with a gap with the first fixed iron core;
• a first movable iron core disposed between the first fixed iron core and the second fixed iron core and attracted by the first fixed iron core by passage of current through the coil;
• a second movable iron core disposed between the first fixed iron core and the second fixed iron core and attracted by the second fixed iron core by the passage of current through the coil;
• a spring that biases the first movable iron core to the second fixed iron core side;
• a regulating part that regulates movement of the first movable iron core to the second fixed iron core side with respect to the second movable iron core;
• a communication passage that causes the first fixed iron core side to communicate with the second fixed iron core side of the second movable iron core;
• and
• an annular filler ring interposed between the first fixed iron core and the second fixed iron core,
• wherein the first movable iron core includes an inner tubular portion and an outer tubular portion that are doubly disposed inside and outside, a connecting portion connecting first ends of an axial direction of the inner tubular portion and the outer tubular portion, and an inner bottom portion located at a second end of the inner tubular portion, and is slidably inserted into the filler ring with the inner bottom portion directed to the second fixed iron core side,
• the second movable iron core is tubular with a bottom and includes an outer bottom portion and an intermediate tubular portion standing on an outer circumference edge of the outer bottom portion and having an inner diameter larger than an outer diameter of the inner tubular portion, and the intermediate tubular portion is slidably inserted into the outer tubular portion with the outer bottom portion directed to the second fixed iron core side, and
• the spring is interposed between the inner bottom portion and the first fixed iron core with a first end side inserted into the inner tubular portion.