The present invention relates to a seat with different hardnesses for a vehicle. More specifically, the present invention provides a seat with difference hardnesses for a vehicle comprising: a main body sheet formed in the shape of a seat of a vehicle and having a recessed groove formed at a position where a back is supported when a passenger is seated a buffering sheet formed to be able to be attached to or detached from the recessed groove of the supporting sheet, composed of a material less hard than the material of the supporting sheet, and having an irregular part formed in the shape of a egg panel to form an air layer on a front surface a friction sheet composed of a material having the same hardness as the hardness of the buffering sheet, formed of a synthetic resin foamed molded body in the shape of a seat, and bonded or fused to the irregular part of the buffering sheet to absorb a load exerted on the buffering sheet and transmit the same to the buffering sheet and a filter sheet formed by immersing felt, which is composed of glass fiber, in a binder and attaching the binder to the rear surface of the friction sheet and the irregular part of the buffering sheet. Therefore, the present invention generates an efficient buffering function by absorbing a load generated by a passenger to the friction sheet and diffusing and buffering a shock remaining after absorption to the friction sheet to the irregular part formed on the buffering sheet to minimize vibration transmitted to the supporting sheet while improving the comfort of the passenger by making the friction sheet and the buffering sheet, which are in contact with the passenger, less hard than the main body sheet. Moreover, the present invention can provide a pleasant indoor environment by allowing the filter sheet to purify harmful materials harmful to human bodies and filter particulate matters and various harmful materials, which are introduced while being mixed with external air, thereby purifying air
