A packing bag for transportation of a specimen, comprising: a body having an opening; and an openable and closable sealing part for sealing the opening, the body comprising: two packing material sheets (4, 5) each formed of a thermoplastic synthetic resin film; and an absorbing material being a cloth-like body, which is sandwiched between the two packing material sheets and formed of a synthetic fiber having a hydrophilic property, characterised in that the absorbing material is an absorbing material having the synthetic resin, which is one of a hydrophilic group selected from among an amide group, a sulfone group, and a carboxyl group for imparting a water-absorbing property, drawn into a fibrous form and then woven into said cloth, and/or said absorbing material having the synthetic resin drawn into a fibrous form and laminated with a hydrophilic group material selected from among an amide group, a sulfone group, and a carboxyl group for further imparting a hydrophilic property, and then woven into said cloth, and in that sides of the two packing material sheets sandwiching the absorbing material at the portions excluding the opening are heat-sealed into a state in which a gap between each of the two packing material sheets and the absorbing material and pores of fibers of the absorbing material are filled, and into a sealed state in which penetration of liquid through the fibers of the absorbing material is prevented. a body having an opening; and an openable and closable sealing part for sealing the opening, the body comprising: two packing material sheets (4, 5) each formed of a thermoplastic synthetic resin film; and an absorbing material being a cloth-like body, which is sandwiched between the two packing material sheets and formed of a synthetic fiber having a hydrophilic property, characterised in that the absorbing material is an absorbing material having the synthetic resin, which is one of a hydrophilic group selected from among an amide group, a sulfone group, and a carboxyl group for imparting a water-absorbing property, drawn into a fibrous form and then woven into said cloth, and/or said absorbing material having the synthetic resin drawn into a fibrous form and laminated with a hydrophilic group material selected from among an amide group, a sulfone group, and a carboxyl group for further imparting a hydrophilic property, and then woven into said cloth, and in that sides of the two packing material sheets sandwiching the absorbing material at the portions excluding the opening are heat-sealed into a state in which a gap between each of the two packing material sheets and the absorbing material and pores of fibers of the absorbing material are filled, and into a sealed state in which penetration of liquid through the fibers of the absorbing material is prevented. two packing material sheets (4, 5) each formed of a thermoplastic synthetic resin film; and an absorbing material being a cloth-like body, which is sandwiched between the two packing material sheets and formed of a synthetic fiber having a hydrophilic property, characterised in that the absorbing material is an absorbing material having the synthetic resin, which is one of a hydrophilic group selected from among an amide group, a sulfone group, and a carboxyl group for imparting a water-absorbing property, drawn into a fibrous form and then woven into said cloth, and/or said absorbing material having the synthetic resin drawn into a fibrous form and laminated with a hydrophilic group material selected from among an amide group, a sulfone group, and a carboxyl group for further imparting a hydrophilic property, and then woven into said cloth, and in that sides of the two packing material sheets sandwiching the absorbing material at the portions excluding the opening are heat-sealed into a state in which a gap between each of the two packing material sheets and the absorbing material and pores of fibers of the absorbing material are filled, and into a sealed state in which penetration of liquid through the fibers of the absorbing material is prevented.