Laminated film and packaging bag

The invention provides a laminated film and a packaging bag. The laminated film (1) comprises a base material layer (2) and a sealant layer (4) which is the outermost surface of one side of the laminated film (1). The base material layer (2) contains 77-99 parts by mass of a high density polyethylene (A) having a density of 0.942-0.970 g/cm3 and a melt mass flow rate of 0.1-3.0 g/10 min at a temperature of 190 DEG C and a load of 2.16 kg, and 1-23 parts by mass of an ultra-high molecular weight polyethylene (B) having a density of 0.930-0.960 g/cm3, with the total being 100 parts by mass. 本发明提供一种层叠膜以及包装袋，该层叠膜(1)包括基材层(2)和作为层叠膜(1)一侧的最外表面的密封剂层(4)。基材层(2)含有77～99质量份的高密度聚乙烯(A)以及1～23质量份的超高分子量聚乙烯(B)，合计100质量份，所述高密度聚乙烯(A)的密度为0.942～0.970g/cm3，在温度为190℃且载荷为2.16kg的条件下熔体质量流动速率为0.1～3.0g/10min，所述超高分子量聚乙烯(B)的密度为0.930～0.960g/cm3。