A vibration of a two- or three-dimensionally spreading observation object such as structures including a bridge and an elevated road is observed and the observation result is visualized. An interferometric vibration observation device (4) comprises a transmitting means (10) transmitting a transmission signal toward an observation object (8), a receiving means (12) receiving a reflection wave from the observation object with a plurality of receiving antennas (20) and generating a reception signal for each of the receiving antennas, and a signal processing means (14) obtaining a phase plane of the reflection wave to an antenna plane from a phase difference between the reception signals, identifying an arrival direction and a signal strength of the reflection wave, calculating a phase variation of the reflection wave from a certain direction, and generating an observation signal representative of a vibration of the observation object or a certain site thereof. If the interferometric vibration observation device (4) is mounted on a vibrating or shaking platform (6), the device generates an image from observation data representative of a vibration of the observation object (8), determines a fixed point from the image, calculates a vibration of the platform (6) from vibration analysis of the fixed point, and removes the vibration from the observation data.
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