A head relaxing pillow, which is generally U-shaped and made of an elastic material, comprising: a supporting main body having a top for supporting the neck of a user lying face up, the supporting main body having a bottom concavely provided with a recess, the supporting main body being provided with two sunken portions which are respectively adjacent to two corresponding ends of the supporting main body and which correspond in position to the user's temporal bones respectively; two contact portions each having a first end connected to one of the two corresponding ends of the supporting main body, the first ends of the contact portions being spaced apart by a first predetermined distance, each said contact portion having a second end extending away from the supporting main body, the second ends of the contact portions being spaced apart by a second predetermined distance, wherein the second predetermined distance is less than the first predetermined distance so as for the contact portions to correspond in configuration to the user's two parietal bones respectively; and a pressing portion extending from a side of the supporting main body and located between the contact portions so that, when the user's neck and head are respectively resting on the supporting main body and the contact portions, not only do the user's temporal bones correspond in position to the sunken portions respectively, but also the supporting main body sags toward the recess due to the weight of the user's neck, causing the two corresponding ends of the supporting main body to bend upward, and consequently the second ends of the contact portions to bend upward toward and thereby support the user's parietal bones, with a free end of the pressing portion bending upward toward and pressing against the user's occipital bone. a supporting main body having a top for supporting the neck of a user lying face up, the supporting main body having a bottom concavely provided with a recess, the supporting main body being provided with two sunken portions which are respectively adjacent to two corresponding ends of the supporting main body and which correspond in position to the user's temporal bones respectively; two contact portions each having a first end connected to one of the two corresponding ends of the supporting main body, the first ends of the contact portions being spaced apart by a first predetermined distance, each said contact portion having a second end extending away from the supporting main body, the second ends of the contact portions being spaced apart by a second predetermined distance, wherein the second predetermined distance is less than the first predetermined distance so as for the contact portions to correspond in configuration to the user's two parietal bones respectively; and a pressing portion extending from a side of the supporting main body and located between the contact portions so that, when the user's neck and head are respectively resting on the supporting main body and the contact portions, not only do the user's temporal bones correspond in position to the sunken portions respectively, but also the supporting main body sags toward the recess due to the weight of the user's neck, causing the two corresponding ends of the supporting main body to bend upward, and consequently the second ends of the contact portions to bend upward toward and thereby support the user's parietal bones, with a free end of the pressing portion bending upward toward and pressing against the user's occipital bone.