Flow path structure, liquid ejecting head, liquid ejecting apparatus, and manufacturing method of flow path structure

A manufacturing method of a flow path structure which forms a flow path of liquid, the method comprising:

• forming a flow path groove of a first flow path on one or both of opposing surfaces of a light absorbing member having absorbing properties with respect to laser light and a light transmitting member having transmitting properties with respect to the laser light;
• forming a flow path pipe which protrudes from a front surface opposite of an opposing surface which is to be oppose the light absorbing member, in the light transmitting member and forming a second flow path which communicates with the first flow path in the flow path pipe;
• stacking the light absorbing member and the light transmitting member;
• and
• forming the first flow path by radiating the laser light toward the light transmitting member and by forming a welding surface that surrounds the flow path groove without overlapping an outer periphery of the flow path pipe in the radiation direction.