Many expect the 56-year-old, who has largely kept a low profile, to continue his father's hardline policies.
More than 60% voters said they wanted to keep the current licence fee levels, initial projections show.
Police say they are investigating other motives after the blast caused minor damage to the embassy building.
The Nikkei Stock Average plunged by more than 4,100 points at one stage at the start of the week as crude oil prices surged sharply, with widespread sell orders hitting Tokyo stocks immediately after the market opened on Monday and pushing the index below the 52,000 level during trading. (News On Japan)
The disappearance of the mother of TV presenter Savannah Guthrie captivated the US, but police have not made any arrests.
More than 60% voters said they wanted to keep the current licence fee levels, initial projections show.
Foreign Secretary Yvette Cooper has hit back at President Trump's criticism of the UK response to the conflict in Iran.
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