Cervical pillow

A cervical pillow comprising:

• a pillow body (A) including:
• a supine posture support part (100);
• and a side-lying posture support part (200) configured to extend in each direction from the supine posture support part (100), and made of a material with elasticity and resilience,
• wherein the supine posture support part (100) is provided such that an upper surface thereof is flush with an upper surface of the side-lying posture support part (200), and has an alignment guide groove (110) recessed upward on a bottom surface corresponding to an upper surface part configured to support a head and a neck of a user lying in a supine position, wherein the alignment guide groove (110) comprises:
• a first alignment guide part (111) configured to be depressed by a head of a user lying in the supine position;
• and
• a second alignment guide part (112) recessed to have a lower height than the first alignment guide part (111) and configured to be depressed by a neck of the user lying in the supine position,
• wherein the first alignment guide part (111) is shaped like a square horn, and
• wherein a bottom of the second alignment guide part (112) has a left-right width that is same as a left-right width of a bottom of the first alignment guide part (111), and a left-right width of a top of the second alignment guide part (112) is larger than a left-right width of a top of the first alignment guide part (111).