Idar State  or Edar, was a native state of India, which formed part of the Mahi Kantha Agency, within the Gujarat Division of Bombay. It has an area of 1669 m²., and a population (1901) of 168,557, showing a decrease of 44% in the decade as the result of famine. Estimated gross revenue, £29,000; tribute to the gaekwar of Baroda, £2000. In 1901 the raja and his posthumous son both died, and the succession devolved upon Pratap Singh of Idar (q.v.) of Jodhpur. The line of railway from Ahmedabad through Parantij runs mainly through this state. Much of the territory is held by kinsmen of the raja on feudal tenure. The products are grain, oil-seeds and sugar-cane. The town of Idar is 64 m. N.E. of Ahmedabad. Pop. (1901) 7085. It was formerly the capital, but Ahmednagar (to the east of Himatnagar, pop. 3200) was the capital by the end of the British Raj.
In 1941 Idar had a population of 307,798.
Idar State was founded in the 13th century and was ruled by Rajputs. In 1791, it was split into five states: Idar, Ahmadnagar, Morasa, Baad (also called Bayar) and Soor. In 1821, Morasa was absorbed by Ahmadnagar. In 1826, Baad absorbed by Idar and Ahmadnagar. In 1843, Idar was reunited.
In 1924 it was made part of the Western India States Agency. It was transferred to the Rajputana States in the early 1940s. In 1949 it was dissolved and split between Sabar Kantha district and Mehsana district which were at that point in Bombay State. Both these districts were included in Gujarat when it was formed in 1960.
Rulers of Idar
Rajas of Idar
- 1731-1751 Anand Singh ( -1753)
- 1751-1791 Shiv Singh (1736–1791), His second son founded a separate branch of the dynasty, which ruled as Maharajas of Ahmednagar from 1792 until 1843, when Takht Singh, the last Maharaja, became Maharaja of Jodhpur and continued the Ahmednagar line from there.
- 1791-1792 Bhawan Singh (1755–1792)
- 1792-1833 Gambhir Singh (1781-12 August 1833)
- 12 August 1833-26 December 1868 Jawan Singh, KCSI (1830-26 December 1868)
- 26 December 1868-February 1901 Keshri Singh, KCSI (1864-February 1901)
- Interregnum from February–October 1901
- October-30 November 1901 Krishna Singh (October 1901-30 November 1901). A posthumous son of Sir Keshrisinhji, who "ruled" from his birth, eight months after his father's death, to his own death a month later.
- January 1902 - 1902 Maharaja Sri Sir Pratap Singh, GCB, GCSI, GCVO, LLD (22 October 1845-4 September 1922)
Maharajas of Idar
- May 1911-14 April 1931 Daulat Singh, KCSI (12 May 1875-14 April 1931)
- 14 April 1931 - 15 August 1947 Himmat Singh, (2 September 1899-24 November 1960)
- Daljit Singh (10 July 1917-17 May 1992)
- Rajendra Singh (25 September 1938-)
Rajas of Ahmadnagar
- 1791 - 1798 Sangram Singh
- 1798 - 1835 Karan Singh
- 1835 - 1839 Prithvi Singh
- 1839 - 1841 ...
- 1841 - 1843 Takht Singh
Rajas of Morasa
- 1791 - 1806 Zalim Singh
- 1806 - 1821 Pratap Sing
Rajas of Baad
- 1791 - 1826 Amir Singh
Rajas of Soor
- 1791 - Indra Singh
- Columbia-Lippincott Gazeteer, p. 824