Human parainfluenza virus type 2 (hPIV2), one of the causative agents of infantile common cold, is a non‐segmented negative‐sense RNA virus with a robust gene expression system. It infects recurrently throughout human life without causing severe disease. Because hPIV2 has a viral envelope that can carry ectopic proteins, we developed a non‐propagative RNA/protein‐carrying vector BC‐PIV by deleting the F gene from hPIV2. BC‐PIV can be vigorously proliferated in the stable packaging cell line Vero/BC‐F cells expressing the hPIV2 F gene but not in other cells. BC‐PIV can deliver exogenous gene(s) on a multigenic RNA genome as an inserted gene fragment(s) and simultaneously deliver exogenous protein(s) on its envelope in a membrane‐anchored form. For example, influenza virus M2e protein, Ebola virus GP protein, and severe acute respiratory syndrome‐coronavirus‐2 (SARS‐CoV‐2) spike protein were shown to be highly expressed in packaging cells and incorporated into the virion. The Ebola virus GP protein and SARS‐CoV‐2 spike protein, each delivered via BC‐PIV, efficiently induced neutralising antibodies against each virus, even after prior treatment with recombinant BC‐PIV in mice and hamsters, respectively. In this review, we describe the properties of BC‐PIV as a promising vaccine vector, and also demonstrate its application as an anti‐tumour virus.