PROBLEM TO BE SOLVED: To provide a seismic strengthening structure and the like, which can be simply mounted even on an object built many years ago and which do not impose a heavy burden on occupants.SOLUTION: A seismic strengthening structure comprises: vibration control means for absorbing seismic energy; mounting means for mounting the vibration control means on the outside of a building; and horizontal support means for almost horizontally supporting the vibration control means. Additionally, the mounting means is installed in a dotted pattern on an existing building girder beam, and the horizontal support means is a horizontal tie beam for horizontally tying the mounting means.
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