Mattress and mattress cover

A mattress comprising:

• a mattress cushion;
• and
• a mattress cover which accommodates the mattress cushion and on which a user is capable of lying,
• wherein (a) the mattress cushion is formed with a cushion member or a plurality of cushion members each of which is the cushion member and which are arranged side by side,
• the cushion member includes:
• a mattress core member that includes a filament three-dimensional bonded member obtained by bonding molten thermoplastic resin filaments in a three-dimensional net shape, and is entirely formed in a shape of a flat plate;
• and
• an inner cover that accommodates the mattress core member,
• in the inner cover, an exposure region is formed that exposes parts of an upper surface and a lower surface of the mattress core member,
• (b) the mattress cover includes:
• an upper surface cover portion that covers an upper part of the mattress cushion;
• and
• a side surface cover portion that is connected to the upper surface cover portion, and covers and tightens an area extending from side surfaces of the mattress cushion to a peripheral edge portion of a lower surface of the mattress cushion and
• the mattress cover opens the exposure region of the inner cover such that the mattress core member is visually recognizable.

A cushion member or a plurality of cushion members each of which is the cushion member and which are arranged side by side,

• wherein the cushion member or the plurality of cushion members form a mattress cushion accommodated in a mattress cover on which a user is capable of lying,
• the cushion member includes:
• a mattress core member that includes a filament three-dimensional bonded member obtained by bonding molten thermoplastic resin filaments in a three-dimensional net shape, and is entirely formed in a shape of a flat plate;
• and
• an inner cover that accommodates the mattress core member and
• in the inner cover, an exposure region is formed that exposes parts of an upper surface and a lower surface of the mattress core member.