Resin composition and use thereof

A film formed from a resin composition comprising a hydrogenated block copolymer product [D] and a plasticizer, wherein:

• the hydrogenated block copolymer product [D] is a hydrogenated block copolymer product obtained by hydrogenating a block copolymer [C], the block copolymer [C] being composed of
• a polymer block [A] containing a repeating unit [I] derived from an aromatic vinyl compound as a main component, and
• a polymer block [B] containing the repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound as main components;
• (i) a ratio (wA/wB) of wA to wB is 45/55 to 85/15 where the wA is a weight fraction of the polymer block [A] in the block copolymer block [C] and the wB is a weight fraction of the polymer block [B] in the block copolymer block [C];
• (ii) a ratio (w[IB]/w[IIB]) of w[IB] to w[IIB] is 40/60 to 55/45 where the w[IB] is a weight fraction of the repeating unit [I] in the polymer block [B] and the w[IIB] is a weight fraction of the repeating unit [II] in the polymer block [B];
• and
• (iii) in the hydrogenated block copolymer product [D], 90% or more of all unsaturated bonds in the block copolymer [C] are hydrogenated;
• and
• the film is a stretched film having Re of 20 nm or less, and Rth of −10 nm or more and 10 nm or less.