Rubber composition for solid golf ball and solid golf ball

A rubber composition for solid golf balls comprising the following components (a), (b), (c), (d), and (e):

• (a) 50 to 100 parts by weight of a polybutadiene rubber with a 1,4-cis bond content of 80% or more, a 1,2-vinyl bond content of 2.0% or less, and a ratio (Mw/Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of 3.5 or less;
• wherein said polybutadiene rubber is a modified polybutadiene rubber produced by polymerizing butadiene in the presence of rare earth catalyst, thereby obtaining a polymer;
• and
• reacting said polymer with a terminal modification agent;
• (b) 0 to 50 parts by weight of a diene-type rubber other than the component (a), provided that the total amount of the component (a) and component (b) is 100 parts by weight;
• (c) 10 to 50 parts by weight of a crosslinking monomer;
• (d) 20 to 80 part by weight of inorganic filler;
• and
• (e) an effective amount of an organic peroxide.