[Object] The present invention provides an antibacterial and antiviral agent that includes an aqueous solution of a silicon-containing compound that has an antibacterial functional group, the aqueous solution having high stability over time and a strong deodorant effect.[Means of Realizing the Object] An aqueous solution that includes a silicon-containing compound represented by the following general formula (1)(in which, R1 represents a hydrocarbon group having 6 or more carbon atoms, R2 and R3 are optionally the same or different and represent a lower hydrocarbon group, R4 represents a divalent lower hydrocarbon group, R5, R6, and R7 are optionally the same or different and represent a lower alkyl group or a lower alkoxy group, and X represents a halogen ion or an organic carbonyloxy ion), and a cyclodextrin or a cyclodextrin derivative
