Inducer and pump

An inducer comprising:

• a hub;
• a blade which radially protrudes from the hub and is helically provided;
• and
• a wedge surface which is provided on a negative-pressure surface of the blade so as to be inclined with respect to a camber line connecting intermediate points between the negative-pressure surface and a positive-pressure surface of the blade and toward a leading edge, the negative-pressure surface of the blade being a surface facing an upstream of a fluid of which a pressure is increased by the inducer,
• wherein a first distance between the camber line and the leading edge coincides with a second distance between the camber line and the positive-pressure surface of the blade in a region radially outward from a position at which a height ratio of the blade is 0.5,
• wherein the height ratio of the blade is a ratio of a distance from a connection portion between the hub and a root portion of the blade with respect to a height of the blade which is a distance from the connection portion between the hub and the root portion of the blade to a tip portion of the blade in the radial direction of the blade, and
• wherein the inducer comprises a thick portion, in which the first distance is less than the second distance, on the positive-pressure surface of the blade in a region radially inward from the position at which the height ratio of the blade is 0.5.