An air-conditioned mattress (1) includes a mat device (10), a cover device (20), and an air-conditioning device (30). The mat device (10) includes a first mat (11) configured as a three-dimensional structure (15) made from a plurality of elastic thermoplastic filaments (16) that are randomly tangled with each other. The thermoplastic filaments (16) are fixedly connected at contact portions (17) of the thermoplastic filaments (16) in a way that through holes are formed at non-contact portions (18) of the thermoplastic filaments (16). The cover device (20) covers the mat device (10) and contacts the top surface of the first mat (11), and the first mat (11) is more air-permeable than the cover device (20). The air-conditioning device (30) is disposed inside or outside the mat device (10) and provides heated air flow or cooled air flow into the first mat (11).
