The invention provides a propylene random block
copolymer (A) that has a melt flow rate from 0.1 to 100 g / 10 min and a
melting point from 100 to 155° C. and includes 90 to 60% by weight of a portion insoluble (Dinsol) in n-
decane at
room temperature and 10 to 40% by weight of a portion soluble (Dsol) in n-
decane at
room temperature, wherein the Dinsol satisfies the following requirements (1) through (3) and the Dsol satisfies the following requirements (4) through (6). The invention further provides molded articles such as sheets, films, injection molded articles, hollow molded articles, injection blow molded articles and fibers, which are formed of the propylene random block
copolymer (A) or a propylene resin composition containing the propylene random block
copolymer (A). (1) The molecular
weight distribution (Mw / Mn) obtained by GPC of the Dinsol is from 1.0 to 3.5, (2) the content of skeletons derived from
ethylene in the Dinsol is from 0.5 to 13% by mole, (3) the total amount of 2,1- and 1,3-propylene units in the Dinsol is 0.2% by mole or less, (4) the molecular
weight distribution (Mw / Mn) obtained by GPC of the Dsol is from 1.0 to 3.5, (5) the
intrinsic viscosity [η] in
decalin at 135° C. of the Dsol is from 1.5 to 4 dl / g and (6) the content of skeletons derived from
ethylene in the Dsol is from 15 to 35% by mole.