The device, which was in a small plastic bottle, went off at around 0730 GMT, 20 metres (yards) from the building in the central Kizilay district, one-and-a-half hour before a cabinet meeting to be headed by Erdogan.
Police blocked access to the blast zone – the entrance to the parking lot of the supreme court of appeals, fearing a second explosion, said NTV. The injured was a court employee, it added.
Security guards at Erdogan’s office also rushed to the scene.
The blast followed a remote-controlled bomb attack in Istanbul last week near Erdogan’s ruling party headquarters, which wounded 15 police officers and one civilian.
In September, a powerful bomb rocked the centre of the capital Ankara, killing three people and wounding at least 15 others.
A bomb blast in May last year injured eight people near a bus stop in Etiler, an upscale district in Istanbul.
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