Wet friction disc and friction engaging device

A wet friction disc comprising:

• a friction surface that frictionally slides on a mating member disposed so as to face the wet friction disc in an axial direction;
• and
• a lubrication groove which is provided in an opposite surface that faces the mating member and through which a lubricant supplied to the friction surface flows, wherein:
• the lubrication groove has a plurality of circumferential groove portions that extends in a circumferential direction and a plurality of intersecting groove portions that extends in directions intersecting the circumferential direction;
• and
• at least one of the circumferential groove portions has a through-hole that extends through the wet friction disc between the opposite surface and a surface on the opposite side in the axial direction.