The younger Mr Kim is thought to be in his late 20s and has no military experience
The youngest son of North Korean leader Kim Jong-il has been appointed to two key party posts, in a move widely seen as part of a gradual transfer of power.
State media said Kim Jong-un was named vice-chairman of the Central Military Commission of the ruling Workers’ Party, which is holding a rare meeting.
He was also appointed to the party’s central committee. Earlier, the younger Mr Kim was made a four-star general.
His father was re-elected as leader but is thought to be in poor health.
Kim Jong-un is Kim Jong-il’s third son and had already been identified as the most likely successor to the Communist dynasty started by his grandfather, Kim Il-sung, in 1948.
Little is known of Kim Jong-un other than that he was educated in Switzerland and is about 27 years of age.
The Workers’ Party is holding its first meeting since 1980.
The conference also made the leader’s sister a member of the political bureau and her husband an alternate member, the state-run KCNA news agency reported.
Kim Jong-il and the handover of power
Aged 68, Kim Jong-il is said to be frailGroomed as successor to father, Kim Il-sung, from mid-1970sGiven military role and position in Workers’ Party secretariat in 1980Finally became leader in 1994 on father’s deathGuide: Secretive ‘first family’
The pair had been considered key backers of the young son.
The priority of military positions in North Korea’s secretive power apparatus stems from the policy known as “songun” or military first.
The military, backed up by a standing army of 1.2 million troops, is said to run the country’s political process through the National Defence Commission, chaired by Kim Jong-il.
The 68-year-old leader has been described as frail and is said to have had a stroke two years ago.
Kim Il-sung is known as the “eternal president”, while Kim Jong-il has styled himself the “dear leader”.
Kim Jong-il became leader when his father died in 1994.
Under his rule, the country’s isolation from the outside world has become entrenched.
Mr Kim has built up a personality cult around his family, while North Korea’s economy has all but ceased to function and its people suffer from frequent food shortages.
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