Shoe sole member, method for producing the same, and shoe

A shoe sole member, formed by at least two different polymer compositions, a first polymer composition and a second polymer composition, comprising:

• a first part formed by the first polymer composition;
• a second part formed by the second polymer composition;
• and
• a third part formed by a mixture of the first polymer composition and the second polymer composition between the first part and the second part, wherein:
• the first part has an Asker C hardness higher than the second part, and
• the value of an Asker C hardness of the third part in a cross section orthogonal to a central axis of the shoe sole member continuously decreases throughout the third part from a side of the first part toward a side of the second part.