To provide a blow-molded container having a good medicine resistance and forming less fine particles into a medicine.

This blow-molded container uses a polyethylene-based resin satisfying the following (A) to (D) conditions. (A) Having ≥890 kg/m3 and ≤980 kg/m3 density. (B) The number of ≥6C long chain branches is ≥0.01 and ≤3 based on 1,000 carbon atoms. (C) A melt strength (MS190) (mN) measured at 190°C and MFR (g/10 min, 190°C) under 2.16 kg load satisfy formula (1): MS190>22 x MFR-0.88---(1), and also the melt strength (MS160) (mN) measured at 160°C and MFR (g/10 min, 190°C) under 2.16 kg load satisfy formula (2): MS160>110-110xlog (MFR)---(2), and (D) The number of peaks of an endothermic curve obtained in a rising temperature measurement by a differential scanning type calorimeter is only one.