Provided is an adenovirus vector that expresses high levels of the REIC/Dkk-3 protein. The present invention is a DNA construct for the expression of REIC/Dkk-3 DNA, said construct being obtained by linking, from the 5 end: (i) a CMV promoter (ii) REIC/Dkk-3 DNA (iii) a polyadenylation sequence and (iv) an enhancer obtained by linking a telomerase reverse transcriptase (hTERT) enhancer, a SV40 enhancer, and a CMV enhancer, in that order.本發明提供一種高度表現REIC/Dkk-3蛋白質之腺病毒載體。一種用以使REIC/Dkk-3 DNA表現之DNA構建物,其自5末端側連接有(i)CMV啟動子;(ii)REIC/Dkk-3 DNA;(iii)polyA附加序列;以及(iv)以hTERT(Telomerase Reverse Transcriptase,端粒酶逆轉錄酶)促進子、SV40促進子及CMV促進子之順序連接而成之促進子。