The present invention provides a hygienic cushion which can be washed in water exhibits excellent air permeability and is light while exhibiting body shape retention and exerting a resiliency force no less than a given standard at an appropriate thickness. A core material (1) for a cushion wherein: one surface or both surfaces of a first layer in a three dimensional mesh structure said first layer being formed from a polyethylene based thermoplastic resin a polyester based thermoplastic elastomer or a mixture of a polyethylene based thermoplastic resin and a polyethylene based thermoplastic elastomer is/are laminated with a second layer containing a thermoplastic resin that is different from that of the first layer； the three dimensional mesh structure has an impact resilience of 13 cm or greater and a hysteresis loss of 13 34%； and the thermal elongation rate of the three dimensional mesh structure in the lengthwise direction before and after a hot air drying test is 0 8% after 30 minutes at 90°C in the case of a polyethylene based thermoplastic resin after 30 minutes at 130°C in the case of a polyester based thermoplastic elastomer or after 30 minutes at 90°C in the case of a mixture of a polyethylene based thermoplastic resin and a polyethylene based thermoplastic elastomer.
